BAGHDAD, Iraq – At least 50 people were killed in Iraq yesterday in violence that that included a mortar attack, military firefights, roadside bombs, and other explosions.

In addition, the American military reported the deaths of six soldiers and airmen yesterday, including two who were killed when their helicopter apparently was shot down southwest of Baghdad. The American military said in a statement that it had recovered the remains of two pilots of a U.S.AH-64D Apache Longbow helicopter that went down during a combat air patrol southwest of Baghdad.

In the single deadliest incident, at least nine people, including three women and two children, were killed in a mortar barrage on the south Baghdad neighborhood of Dora, according to Baghdad police colonel Abdullah Nuaimi.

The bodies of 10 men, all blindfolded and hands bound, were found in three areas of west Baghdad, Mr. Nuaimi said. All the men had been shot.

About 40 miles north of Baghdad, in the village of Gubba, insurgents blew up the local Shiite mosque, leaving it in ruins and killing a guard, Baqubah police colonel Adnan Lafta said.

Two American soldiers on foot patrol were killed by a roadside bomb in central Baghdad on Saturday. A Marine died from wounds sustained during hostile action Friday in Anbar province, a stronghold of Sunni insurgents west of the capital. And a soldier died of injuries received March 30 in a non-battle-related operation in Kirkuk.

Two adults and three children, were killed when a firefight erupted in Ramadi, an insurgent hotbed 55 miles west of Baghdad, after an American military Humvee was struck by a roadside bomb, a local hospital official and witness said.