This undated photo provided by Eric Griego shows Nehemiah Griego. Griego is charged with killing five family members, including his father, mother, and three youngest siblings in Albuquerque, N.M. Authorities in New Mexico say Griego had reloaded his guns after the attacks and planned to go to a Wal-Mart and randomly shoot people. Instead, they say he texted a picture of his dead mother to his 12-year-old girlfriend, then spent much of Saturday with her. The two went to the church where his father had been a pastor, and Griego eventually confessed to killing his parents and three younger siblings. (AP Photo/Courtesy of Eric Griego)

Bernalillo County Sheriff Dan Houston, right, and Lt. Sid Covington answer questions about the shooting deaths of five family members during a news conference at the sheriff's headquarters in Albuquerque, N.M., on Tuesday, Jan. 22, 2013. Authorities have charged Nehemiah Griego, 15, with murder and child abuse counts in connection with the slaying of his family. (AP Photo/Susan Montoya Bryan)

ALBUQUERQUE, N.M. (AP) — The New Mexico teen accused of killing his family and plotting to randomly gun down Wal-Mart shoppers spent much of the day after the early morning slayings at his church, wandering the campus as dozens of Sunday school teachers were being trained on how to deal with a shooter, a security official said.

But it wasn't until hours later, former police officer and Calvary Albuquerque security chief Vince Harrison said, that he knew something had gone terribly wrong.

Harrison, who led the safety training Saturday morning, said he was called back to the church that evening after 15-year-old Nehemiah Griego told a pastor he found his family dead in their home.

"When I met Nehemiah, I knew something wasn't right," Harrison said Wednesday. "I could feel it, I could see it in his eyes and I could see it in his behavior and his demeanor so the red flags went up and that's when I called the sheriff's department."

Harrison, who had known the Griego family for about 10 years, said he drove the teen back to the family's rural southwest Albuquerque home to meet authorities, interviewing him along the way.

"He went into detail of where they were, where the guns were and he was very matter-of-fact, really cold so I knew something wasn't right," Harrison said.

After finding the bodies, sheriff's officials say, they took the teen to headquarters. During questioning, they say he confessed to shooting his mother and three younger siblings in their beds shortly after 1 a.m., then waiting in a bathroom with a military-style semi-automatic rifle to ambush his father upon his return from an overnight shift at a homeless shelter.

They say he also told them he had reloaded the family's rifles and taken them with him in the family van with plans to randomly shoot more people.

"That sends chills down my spine," Harrison said. "But obviously God had a different plan."

Harrison said several people spotted Griego at the church throughout the day and told him hello, thinking nothing of it until his arrest. He said officials then reviewed security video and found the teen had spent much of the day there.

The video has been turned over to investigators, who have been working to piece together what led to the violence and what happened in the hours that followed.

Harrison said he doesn't know why Griego decided to come to the church, but that it was like a second home for the boy, who was homeschooled.

"It was a familiar place to him," he said. "I think if he did have in his mindset to do something foolish and start shooting people there also, I think his demeanor was tamed a little bit because he saw people there he knew."

Sheriff Dan Houston said Tuesday there was no indication Griego intended to harm anyone at the church. The sheriff also said Griego and his girlfriend had spent much of the day together.

A prayer vigil was held at the church Wednesday night for victims Greg Griego, 51, his wife, Sarah Griego, 40, and three of their children — a 9-year-old boy, Zephania Griego, and daughters Jael Griego, 5, and Angelina Griego, 2.

Before the start of the vigil, members of the crowd shared hugs and handshakes as photographs of the victims were displayed on large digital screens at the front of the church. An estimated 2,000 people attended and nearly every seat was filled before the start of the hour-long service.

"Our hearts break, Lord," Pastor Skip Heitzig told the crowd. "We, often in times like these, scratch our heads and wonder why. We are at a loss for words and we are certainly at a loss for explanation."

Heitzig shared stories about Greg Griego, who once served as pastor at Calvary. He said Greg was always ready to "get his hands dirty" and was dedicated to helping others find God through his work as a pastor and as a volunteer chaplain. He also urged the crowd to remember that forgiveness and restoration — two tenets dear to Greg — will be important as the community moves forward.

Relatives in a statement Tuesday night said they were heartbroken, and remembered the teen as a bright and talented musician who played guitar, drums and bass with the church choir. He also was a champion wrestler who dreamed of following his family's long tradition of military service, and a boy who accompanied his pastor father on rescue missions to Mexico, they said.

"We have not been able to comprehend what led to this incredibly sad situation. However, we are deeply concerned about the portrayal in some media of Nehemiah as some kind of a monster."

The statement, emailed by the boy's uncle, Eric Griego, called on the media and the public not to use 15-year-old Nehemiah Griego "as a pawn for ratings or to score political points."

"He is a troubled young man who made a terrible decision that will haunt him and his family forever," the statement said.

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Associated Press Writer Jeri Clausing in Albuquerque, N.M., contributed to this report.

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Follow Susan Montoya Bryan on Twitter: http://www.twitter.com/susanmbryanNM

In a bellicose statement singling out the United States as the "sworn enemy" of the Korean people, North Korea announced plans on Jan. 24 for a third nuclear testand continued rocket launches View Gallery

In a bellicose statement singling out the United States as the "sworn enemy" of the Korean people, North Korea today announced plans for a third nuclear test and continued rocket launches.

The move is seen as a disappointment to those who hoped the country's new leader, Kim Jong-Un, might take a less aggressive path than his predecessor and father, Kim Jong-il.

It is also seen as a direct challenge to President Obama and South Korea's newly elected president, Park Geun-hye, who takes office next month.

The statement from North Korea's National Defense Commission read:

"Settling accounts with the U.S. needs to be done with force, not with words as it regards jungle law as the rule of its survival."

The renewed threats come in response to the U.S. backed resolution tightening sanctions against North Korea after its December rocket launch.

At that time, North Korea repeatedly insisted that the launch was simply part of its peaceful space program. The recent statement made no mention of that.

It read: "We are not disguising the fact that the various satellites and long-range rockets that we will fire and the high-level nuclear test we will carry out are targeted at the United States."

South Korean officials analyzed debris from the December launch that, they say, indicates North Korea built and tested crucial components for a missile that can fly further than 6,200 miles.

Analysts say that preparations at the Pungyee test site in northeastern North Korea are underway and that a new underground test could take place on short notice.

Within the international monitoring community it is not believed that North Korea currently has the capability to launch a long-range rocket with the capacity to reach the United States or the technology to mount a nuclear warhead on a long-range missile. But the U.S. is not pleased with North Korea's plans. Glyn Davies, the top U.S. envoy to the region, said in Seoul, "We hope they don't do it. We call on them not to do it."

China, North Korea's main ally in the region, is also urging restraint. China backed the U.S. resolution at the United Nations and today the Foreign Ministry cautioned North Korea not to take further steps to increase tension.

Al Qaeda Affiliate in Africa Threatens U.S. Interests

Three Americans were among the more than three dozen foreign workers killed after a four-day hostage crisis at a BP joint-venture gas facility in Algeria. The terrorist attack is yet another sign of growing al Qaeda cells in north and west Africa, specifically al Qaeda in the Maghreb (AQIM). A Pentagon spokesman said this affiliate of the notorious terrorist group was involved in the Algeria attack. AQIM and other radical Islamist groups pose an increasing threat to U.S. and Western interests.

In Mali, jihadists are now being countered by French forces fighting alongside soldiers from neighboring West African countries. ABC News’ Bazi Kanani reports from Mali’s capital, Bamako, that the presence of French soldiers is a huge relief to people there. Just two weeks ago Mali’s government knew there was no way its own army could stop the advance of the jihadists who have taken over more than half of the country. But this war is just getting started and now—especially after the attack in Algeria—there is great concern about how the militants may try to strike back. U.S. citizens living in Mali have been told it’s time to consider leaving.

Meanwhile, U.S. Air Force planes are now arriving at a base in southern Mali. C-17 transport planes are carrying in French soldiers, equipment and vehicles. The U.S. has said it will not send combat troops into Mali but it is supporting the mission. The U.S. is providing logistical help, such as the transport flights. It has also increased intelligence sharing with France and sent military trainers into neighboring West African countries which are sending in their troops.

For perspective on the threats posed by AQIM and the U.S. role in this region of Africa, Christiane speaks with Rep. Mike Rogers (R-Mich.). He is the chairman of the House Intelligence Committee.