'Grenade used' in suicide attack
A fire burns after fighting near Baghdad's Al Wazir Mosque.
BAGHDAD, Iraq (CNN) -- Investigators believe a hand grenade and not an explosives belt was used in a suicide attack that injured three U.S. Marines and one sailor, a U.S. officer told CNN Friday.
The attack occurred at about 7:40 p.m. Thursday (11:40 a.m. ET) at a U.S. Marine checkpoint in Saddam City, Baghdad's Shia community.
The attacker approached the checkpoint near a crowd of Iraqis and shouted something in Arabic which agitated them, Capt. Joe Plenzler of the 1st Marine Division told CNN's Martin Savidge.
The attacker then turned toward the checkpoint and apparently pulled the pin on the grenade, Plenzler said.
Plenzler would not give the conditions of the four injured troops, but CNN's Walter Rodgers said he was told they were seriously wounded.
The Marines on Friday were continuing to battle forces loyal to the crumbling Iraqi regime in Baghdad and working to disarm a city bristling with weapons.