BAGHDAD — A suicide car bomber rammed into a fuel truck today in central Baghdad, killing at least 11 people, police said.

Some 28 others were wounded by the blast, which happened around 1:15 p.m. in the mostly Shiite Muslim Karradah district, police said. The death toll was expected to rise, they said.

Two Iraqi soldiers were among the dead, police said.

The attack comes one day after four attacks killed 183 people on the bloodiest day since the U.S. troop increase began nine weeks ago.

Many of the more than 230 Iraqis killed or found dead nationwide Wednesday were buried in quiet ceremonies before today's noon prayer, according to Muslim tradition. Other bodies lay in refrigeration containers, still unidentified, at morgues across Baghdad.

Suspected Sunni insurgents penetrated the Baghdad security net Wednesday. The most devastating blast struck the Sadriyah market as workers were leaving for the day, charring a lineup of minibuses that came to pick them up. At least 127 people were killed and 148 wounded, including men who were rebuilding the market after a Feb. 3 bombing left 137 dead.

Wednesday's car bombing appeared meticulously planned. It took place at a pedestrian entrance where tall concrete barriers had been erected after the earlier attack. It was the only way out of the compound, and the construction workers were widely known to leave at about 4 p.m. — the time of the bombing.

One builder, 28-year-old Salih Mustafa, said he was waiting for a bus home when the bomb exploded.

"I rushed with others to give a hand and help the victims," he said. "I saw three bodies in a wooden cart, and civilian cars were helping to take away the victims. It was really a horrible scene."

U.S. military spokesman Maj. Gen. William Caldwell told The Associated Press that al-Qaida in Iraq was suspected in the bombing. "Initial indications based on intelligence sources show that it was linked to al-Qaida," Caldwell said in a late-night telephone interview.

Echoing those remarks, U.S. Defense Secretary Robert Gates called the bombings "horrifying" and accused al-Qaida of being behind them.

The attacks appeared to be yet another attempt by Sunni insurgents and al-Qaida to force Shiite militiamen back onto the streets. Radical Shiite cleric Muqtada al-Sadr had ordered his Mahdi Army fighters to put away their weapons and go underground before the security crackdown began, leaving regions like those bombed on Wednesday highly vulnerable.