French defense minister travels to Afghanistan after deadly attack NEW: Four French soldiers were killed in eastern Afghanistan on Friday NEW: France could bring its troops back early if security is not restored The U.S. Defense Department identifies six killed Marines Their chopper crashed in Afghanistan, also on Friday (CNN) -- French Defense Minister Gerard Longuet traveled to Afghanistan to discuss security with local authorities, a spokesman said Saturday, a day after Allied forces suffered heavy losses in the country. A helicopter crash killed six U.S. Marines and a separate attack killed four French soldiers Friday, prompting Paris to consider an early troop withdrawal. If France does not manage to find a solution with the Afghan authorities to ensure better security of the French soldiers, then we will seriously question our military presence in the country. It is too early to speculate what actions would be taken. The minister will return when he feels he has the information and assurances he is looking for," said Col. Thierry Burkhard, spokesman for the defense ministry. President Nicolas Sarkozy has said he was suspending French training operations and combat help as a result of the attack, which injured 15 others. France has 3,935 troops in Afghanistan, according NATO's International Security Assistance Force. The attack in eastern Afghanistan followed a similar shooting last month by an Afghan soldier that killed two French soldiers serving in an engineers' regiment. Also Saturday, the U.S. Department of Defense identified six Marines who were killed in Afghanistan when their helicopter crashed. Two officers were also aboard the CH-53 helicopter: Capt. Daniel D. Bartle, 27, of Ferndale, Washington; and Capt. Nathan R. McHone, 29, of Crystal Lake, Illinois. CNN's Niki Cook contributed to this report.