BEIRUT (AP) — Turkey accused Syria of "state terrorism" Wednesday after a sharp spike in the death toll from the Syrian civil war, and Iran came under new scrutiny with the U.S. alleging that Tehran is flying weapons to President Bashar Assad's regime across Iraqi airspace.

With violence escalating in the nearly 18-month-old crisis, strains rippled across the region as Egypt's president urged Assad to take a lesson from the Arab Spring uprisings that deposed other leaders and step down.

There appears to be no end in sight for the conflict, however. Neither side seems to be able to gain a significant advantage in the fighting that has killed 23,000 people, according to activists' estimates.

Turkey has become one of the strongest critics of Assad and is host to Syrian opposition groups as well as about 80,000 of the more than 200,000 refugees who have fled to surrounding countries to escape the bloodshed.

"The regime has become one of state terrorism," said Turkish Prime Minister Recep Tayyip Erdogan. "Syria is going through a huge humanitarian saga. Unfortunately, as usual, the international community is merely watching the slaughter, massacre and the elimination of Muslims."

The Syrian government's crackdown has led to worldwide condemnation and sanctions, weakened the economy and left Assad an international pariah just as he was trying to open up his country and modernize the economy. His few remaining allies include Iran, Russia and China.

The New York Times reported that U.S. officials believe Iran resumed shipments of military equipment to Syria via Iraqi airspace in July after a three-month hiatus.

Ali al-Moussawi, media adviser to Iraqi Prime Minister Nouri al-Maliki, confirmed that Iranian planes are flying over Iraq to deliver goods to Syria. But he said Tehran has assured al-Maliki that the flights are carrying only food and other humanitarian aid for victims of the civil war.

"The Iraqi government is carefully monitoring this issue both in the sky and ground," al-Moussawi told The Associated Press. He said Iraq has warned Iran against flying weapons though its airspace.

"The Iranian government has said that it respects our decisions," he said. "Until now, there is no evidence of any violation in this regard, and if anyone has any evidence, they should bring it to us and we will take the needed measures."

Sen. Joe Lieberman, I-Conn., said Iraq's failure to stop the flights could threaten the long-term relationship with the U.S. as well as aid Iraq could receive as part of a 2008 strategic pact between the two nations.

"Bottom line, this kind of problem with these Iranian overflights can make it more difficult to proceed with the Strategic Framework Agreement in the manner that the prime minister and we would like to see happen," Lieberman told reporters in Baghdad. "So I hope this is cleared up quickly."

Tommy Vietor, the National Security Council spokesman at the White House, said Tehran "will stop at nothing to support a Syrian regime that is murdering its own people," adding that Iraq, like all other nations, must block Iran from exporting arms.

The United States and other countries are also upset that China and Russia have repeatedly used their veto powers in the U.N. Security Council to block actions that could have led to sanctions against Assad's regime. China says the civil war needs to be resolved through negotiations and not outside pressure.

"I think history will judge that China's position on the Syria question is a promotion of the appropriate handling of the situation," Chinese Foreign Minister Yang Jiechi said at a news conference in Beijing with U.S. Secretary of State Hillary Rodham Clinton. "For what we have in mind is the interests of the people of Syria and the region and the interests of peace, stability and development in the region and throughout the world."

The comment was a direct rebuke to Clinton, who has said the Chinese and Russian vetoes have put those nations "on the wrong side of history."

She responded bluntly to Yang by saying the violence was boiling over into other countries likeJordan and Turkey and that the Security Council has to act.

"It is no secret that we have been disappointed by Russia and China's actions blocking tougher U.N. Security Council resolutions and we hope to continue to unite behind a real path forward to end the violence in Syria," she said.

At a meeting of Arab foreign ministers in Cairo, Egyptian President Mohammed Morsi warned his Syrian counterpart that "it's too late to talk about reform. This is the time for change."

"The Syrian regime must learn from recent history," Morsi said, alluding to the authoritarian regimes that fell in Tunisia, Libya, Egypt and Yemen in the Arab Spring uprisings.

His strong comments followed an address last month during a summit meeting of the nonaligned movement in Tehran, where the Egyptian leader gave a hearty call for world support of Syria's rebels.

In new reports of fighting, the rebels said they shot down a government MiG jet and a helicopter.

The commander of the rebel Free Syrian Army, breakaway air force Col. Riad al-Asaad, told The Associated Press in a telephone interview from Turkey that the aircraft was downed in Abu al-Dhuhour, an area in the northwestern province of Idlib, five days ago.

A video posted online by the opposition showed the wreckage of a jet and the body of a pilot. The AP could not independently confirm the rebel claims or the video.

The narrator of the online video said the MiG was downed Tuesday. The discrepancy could not be immediately reconciled.

Al-Asaad said the rebels used anti-aircraft missiles captured from Syrian army bases. Rebels have claimed before that they have shot down government planes. The regime has acknowledged crashes in the past, but blamed them on mechanical failures.

Still, observers say the country is in for a bloody stalemate.

"It is evident that the regime's increasingly violent crackdown has failed to break the will of the opposition, as robust resistance continues across the country," said James Petretta, an analyst at Maplecroft, a British-based risk analysis company.

"At the tactical level, the regime retains the advantage although not to the extent that it is able to deal a decisive blow to the armed opposition," he said.

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AP writers Suzan Fraser in Ankara, Turkey, Jamal Halaby in Amman, Jordan, Hamza Hendawi in Cairo, Lara Jakes and Qassun Abdul-Zahra in Baghdad and Pauline Jelinek in Washington contributed to this report.

KABUL (Reuters) - The Afghan army has detained or sacked hundreds of soldiers for having links to insurgents, the Defence Ministry said on Wednesday as it tries to stem the rising number of so-called insider attacks.

It made the announcement as NATO chief Anders Fogh Rasmussencalled Afghan President Hamid Karzai to express his concern over the attacks, in which Afghan servicemen have killed at least 45 NATO-led troops this year, including 15 in August, compared with 35 for all of last year.

"Hundreds were sacked or detained after showing links with insurgents. In some cases we had evidence against them, in others we were simply suspicious," Defence Ministry spokesman Zahir Azimi told reporters in Kabul.

"Using an army uniform against foreign forces is a serious point of concern not only for the Defence Ministry but for the whole Afghan government," Azimi said, adding that Karzai had ordered Afghan forces to devise ways to stop insider attacks.

Azimi declined to say whether the detained and fired soldiers were from Taliban strongholds in the south and east, saying they were from all over the country.

He said his ministry started an investigation into the attacks, called green-on-blue attacks, within the 195,000-strong Afghan army six months ago.

In his call to Karzai, Rasmussen outlined measures taken by NATO-led forces to stop the insider attacks and he urged Karzai to join the efforts, according to a NATO spokeswoman.

The measures include strengthening vetting procedures, better counter-intelligence and giving troops cultural awareness training.

NO LACK OF COMMITMENT

The commander of foreign troops in Afghanistan, U.S. General John Allen, said his troops were constantly taking new measures to counter the threat from rogue Afghan soldiers, which have been trained and armed by U.S. and other foreign forces.

Allen said he detected "no absence of commitment" by the Afghan government to counter rogue attacks.

"I believe the Afghan government is committed to doing this, again remembering it's a government that is still building its capacity," he told reporters during a visit to NATO headquarters in Brussels where he briefed ambassadors on the Afghan campaign and on the rogue attacks.

Field commanders in Afghanistan have been given discretion to post more "guardian angel" sentries, who oversee foreign soldiers in crowded areas such as gyms and food halls, to respond to any rogue shootings, officials say.

"We will seek to create ... the opportunity for us if we see something going wrong, in terms of an insider beginning to reveal himself, that we are postured ... to be able to take immediate action as necessary to defend the force," Allen said.

He denied rogue attacks had shattered trust between Afghan and foreign forces but hinted at deep-seated problems.

"It's not at a tactical level that I fear for the relationship, it is at a higher level," he said, without elaborating.

In an interview with Reuters this week, Rasmussen dismissed any suggestion that the attacks would lead to more members of the NATO-led force pulling out early from an increasingly unpopular and costly war that has dragged on with few obvious signs of success since the Taliban were ousted in 2001.

But tension is simmering. The killing of three Australian troops by an Afghan army sergeant in the south last week prompted a deadly raid to find the rogue soldier and led to a war of words between Canberra and Kabul.

U.S. forces said on Sunday they had suspended training new recruits to the 16,000-strong Afghan local police, a militia separate from the Afghan national police, following the spike in insider attacks.

(Additional reporting by Adrian Croft in Brussels; Writing by Amie Ferris-Rotman; Editing by Robin Pomeroy)