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DAMASCUS, Syria – U.S. military helicopters launched an extremely rare attack Sunday on Syrian territory close to the border with Iraq, killing eight people in a strike the government in Damascus condemned as "serious aggression."

A U.S. military official said the raid by special forces targeted the foreign fighter network that travels through Syria into Iraq. The Americans have been unable to shut the network down in the area because Syria was out of the military's reach.

"We are taking matters into our own hands," the official told The Associated Press on condition of anonymity because of the political sensitivity of cross-border raids.

The attack came just days after the commander of U.S. forces in western Iraq said American troops were redoubling efforts to secure the Syrian border, which he called an "uncontrolled" gateway for fighters entering Iraq.

A Syrian government statement said the helicopters attacked the Sukkariyeh Farm near the town of Abu Kamal, five miles inside the Syrian border. Four helicopters attacked a civilian building under construction shortly before sundown and fired on workers inside, the statement said.

The government said civilians were among the dead, including four children.

A resident of the nearby village of Hwijeh said some of the helicopters landed and troops exited the aircraft and fired on a building. He said the aircraft flew along the Euphrates River into the area of farms and several brick factories. The witness spoke on condition of anonymity because of the sensitivity of the information,

Syria's Foreign Ministry said it summoned the charges d'affaires of the United States and Iraq to protest against the strike.

"Syria condemns this aggression and holds the American forces responsible for this aggression and all its repercussions. Syria also calls on the Iraqi government to shoulder its responsibilities and launch and immediate investigation into this serious violation and prevent the use of Iraqi territory for aggression against Syria," the government statement said.

The area targeted is near the Iraqi border city of Qaim, which had been a major crossing point for fighters, weapons and money coming into Iraq to fuel the Sunni insurgency.

Iraqi travelers making their way home across the border reported hearing many explosions, said Farhan al-Mahalawi, mayor of Qaim.