Iraq bombing kills 21

BAGHDAD, Iraq (CNN) -- A bombing at a crowded outdoor market in northern Iraq on Friday killed 21 people and wounded 50 others, according to police.

Nineveh provincial police said the parked car bomb went off in Tal Afar, west of Mosul. There has been violence in Tal Afar throughout the Iraq war, and U.S. and Iraqi troops in Nineveh province have been taking on al Qaeda in Iraq there.

Also Friday, the U.S. military announced that two Marines died in a noncombat-related incident near Karma on Thursday in Anbar province.

Nine American troops have died in Iraq so far this month -- two in combat and the others in vehicle accidents and other noncombat incidents.