U.S. helicopters based in Iraq killed eight people and wounded another in an attack inside Syria's territory Sunday
Syria's state news agency SANA said four U.S. helicopters crossed the border and struck a farm about 8 kilometers (5 miles) inside Syria before returning to Iraqi airspace.
The raid occurred about 4:45 p.m. (1345 GMT). The helicopters hit a civilian building under construction on the farm, killing a father and his four sons, a married couple and another man, SANA said.
Syria's deputy foreign minister contacted the U.S. embassies in Damascus and Baghdad, SANA said.
Lt Col Chris Hughes, spokesman for US forces in Iraq, said the US division that operates on the Iraqi side of the border was not involved in the incident.