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BAGHDAD — A suicide bomber detonated explosives Thursday inside a packed bus bound for a southern Shiite city, killing 32 people and wounding 44, police said. The blast pushed the three-day death toll from suicide attacks in the capital to at least 75.

Meanwhile, the Islamic Army in Iraq claimed to have killed an American hostage, according to a statement on the Internet. The statement did not name him or provide photos, but the group earlier identified its captive as Ronald Alan Schulz and threatened to kill him unless all prisoners in Iraq were released.

The suicide attack occurred as the bus was pulling away from east Baghdad's Nadhaa station. A man carrying a bag suddenly jumped on the vehicle through the open door, apparently waiting to the last moment to avoid security checks.

He was challenged but insisted on taking a seat, police Lt. Wisam Hakim said.

"He sat in the middle of the bus and then the explosion took place," Hakim said.

Police Lt. Ali Mitaab said 32 people were killed and 44 wounded. Most of those killed were on the bus, but several people around a food stall also died, police said.

Officials at the scene said the death toll was especially high because the blast triggered secondary explosions in gas cylinders at the stall.

Several other explosions rumbled through the heart of the capital Thursday morning, including one that struck an American convoy killing a U.S. soldier, the military said. The U.S. command also said that a Marine was killed the day before in a bombing in Ramadi, 70 miles west of Baghdad.

The bus attack occurred two days after a pair of suicide attackers wearing explosives belts killed 43 people and wounded more than 70 at Baghdad's police training academy. Most of those dead in the academy and on the bus were believed to be Shiite Muslims. Most of the insurgents are Sunnis.

The station, the main departure point for buses heading to the Shiite south, was the scene in August of a triple car bombing that killed at least 43 people.

At least 1,819 Iraqis have been killed in suicide attacks since the new government took office on April 28, according to a count by The Associated Press.

White House press secretary Scott McClellan said he could not confirm the death of the American hostage. Schulz's family in North Dakota said he was an electrician.