In one incident, soldiers hit an explosive device while driving in a vehicle in the province of al-Anbar, a US military official told Aljazeera on Wednesday.
Army officials refused to reveal the nationalities of those killed but the area is occupied by US forces.
Near the restive town of Ramadi, west of Baghdad, at least two US soldiers were killed and three others were injured when their Humvee hit an explosive device, eyewitnesses told our correspondent.
In a separate incident also west of Baghdad, four foreigners were killed when their vehicles came under attack, setting them on fire, reported Aljazeera.
Footage from Associated Press Television News showed one man beating a corpse with a metal pole. Others tied a cord to one of the bodies, attached it to a car and drove it down a street, surrounded by a cheering crowd. An Associated Press reporter saw two blackened bodies hanging from a bridge.
"The people of Fallujah hanged some of the bodies on the old bridge like slaughtered sheep," resident Abdul Aziz Mohammed said. Some of the corpses were dismembered, he said.
APTN footage showed the charred bodies of three slain men. Some were wearing flak jackets, said resident Safa Mohammedi.
Whats amazing is the savagery and barbaric way those "peace loving" muslims treat human bodies, Dragging them down the street, hanging them like sheep and playing with the charred corpses. But of course Al-jazeera doesnt mention the dispicable things done by those arabs.