The government has summoned the official US and Iraqi representatives to protest, state television and the official SANA news agency said.

"Four American helicopters violated Syrian airspace around 16:45 local time (1345 GMT) on Sunday. They penetrated eight kilometres (five miles) into Syria," the official media said.

"American soldiers" who had emerged from helicopters "attacked a civilian building under construction and fired at workmen inside, causing eight deaths," the reports said.

"The helicopters then left Syrian territory towards Iraqi territory," SANA said.

The news agency said one person was also wounded in the attack on the village of Al-Sukkiraya, around 550 kilometres (340 miles) northeast of the capital in the Abu Kamal area.

Earlier, the private television channel al-Dunia said nine civilians had been killed in the attack.

The raid appears to have been the first of its type into Syrian territory.

Syria summoned the US and Iraqi envoys to Damascus to protest against what it called a US military attack and to demand that Iraq prevent US forces from "launching aggression against Syria" from its territory, official media said.

"Syria condemns and denounces this act of aggression and US forces will bear the responsibility for any consequences," SANA quoted an official as saying.

"Syria also demands that the Iraqi government accept its responsibilities and launches an immediate inquiry following this dangerous violation and forbids the use of Iraqi territory to launch attacks on Syria," it said.

"We are in the process of investigating this" reported attack, Sergeant Brooke Murphy, a US military spokeswoman, told AFP in Baghdad.

In Washington, a Pentagon spokesman declined to comment. Commander Darryn James told AFP that there was "no response" from the US Department of Defence about the Syrian reports.

The Iraqi defence ministry also refused to comment, on the grounds the incident took place inside Syria.

US commanders say Syria is the main transit point for foreign jihadists crossing into Iraq. Washington has blamed Damascus for turning a blind eye to the problem.

On October 16 Iraqi forces arrested seven Syrian "terrorist" suspects at a checkpoint near the city of Baquba, a hub of Al-Qaeda fighters, the Baghdad defence ministry said.

Iraqi President Jalal Talabani told US President George W. Bush last month that Iran and Syria -- long targets of US blame over the deadly unrest in Iraq -- no longer pose a problem.

Iraqi officials have also said that Syria has been boosting border security.

Syria's first ambassador to Iraq in 26 years took up his post in Baghdad this month, marking the official end of more than two decades of icy relations.

On September 28 US Secretary of State Condoleezza Rice confirmed she had met her Syrian counterpart, Walid Muallem, to discuss Middle East peace efforts despite renewed criticism from Washington over Syrian policies.

Their talks came after Bush slammed Syria in his farewell address to the UN General Assembly. "A few nations -- regimes like Syria and Iran -- continue to sponsor terror," he charged.

Washington has also accused Damascus of failing to give adequate cooperation to the International Atomic Energy Agency in its investigation into a mystery facility bombed by Israel in September last year that US officials have charged was a nuclear plant.

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