BAGHDAD, July 12 — Clashes in a southeastern neighborhood here between the American military and Shiite militias on Thursday left at least 16 people dead, including two Reuters journalists who had driven to the area to cover the turbulence, according to an official at the Interior Ministry.

The two Reuters staff members, both of them Iraqis, were killed when troops on an American helicopter shot into the area where the two had just gotten out of their car, said witnesses who spoke to an Agence France-Presse photographer who arrived at the scene shortly after their bodies were taken away.

The Reuters employees were Namir Noor-Eldeen, 22, a photographer, and Saeed Chmagh, 40, a driver.

“When we reached the spot where Namir was killed, the people told us that two journalists had been killed in an air attack an hour earlier,” said Ahmad Sahib, the Agence France-Presse photographer, who had been traveling in a car several blocks behind Mr. Noor-Eldeen but was delayed by the chaos in the area. He said he was in touch with Mr. Noor-Eldeen by cellphone until his colleague was killed.

“They had arrived, got out of the car and started taking pictures, and people gathered,” Mr. Sahib said. “It looked like the American helicopters were firing against any gathering in the area, because when I got out of my car and started taking pictures, people gathered and an American helicopter fired a few rounds, but they hit the houses nearby and we ran for cover.”