Baghdad ? The body of a Chaldean Catholic archbishop was found in a shallow grave in northern Iraq on Thursday, two weeks after he was kidnapped by gunmen in one of the most dramatic attacks against the country’s small Christian community.

The sad discovery of Archbishop Paulos Faraj Rahho’s body came on a day that saw more violence elsewhere in Iraq. A parked car bomb exploded in a commercial district of central Baghdad, killing 18 people and wounding dozens more, police said. Gunmen also killed five members of an anti-al-Qaida group near Tikrit, and a correspondent for a newspaper in Baghdad.

Pope Benedict XVI, President Bush and Iraq’s prime minister all deplored the archbishop’s death, with the pontiff calling it an “inhuman act of violence that offends the dignity of the human being and harms the peaceful coexistence of the dear Iraqi people.”

Since the U.S.-led invasion in 2003, Iraqi Christians have been targeted by Islamic extremists who label them “crusaders” loyal to U.S. troops.

Militants have attacked churches, priests and businesses owned by Christians. Many Christians have fled the country, a trend mirrored in many dwindling pockets of Christianity across the Islamic world.

Rahho, 65, was seized on Feb. 29, just minutes after he delivered a mass in Mosul, a city considered by the U.S. military the last urban stronghold of al-Qaida in Iraq. Three of Rahho’s companions were killed.

After two weeks of searching and praying, officials at the archbishop’s church received a phone call Wednesday from the captors. The caller told the officials that Rahho had died and where to find his body, Monsignor Shlemon Warduni, the auxiliary bishop of Baghdad, told The Associated Press.

It was not immediately clear if Rahho was killed or if he died of an illness. Shortly after his abduction, church officials had said they were especially worried because the archbishop had health problems, which they did not identify.

A Mosul morgue official, speaking on condition of anonymity for security concerns, said Rahho’s body had no bullet holes. The official said police found the body in an early stage of decomposition under a thin layer of dirt just north of the city, suggesting that Rahho had been dead for a few days.

There have been no claims of responsibility for the archbishop’s kidnapping or his death.

The Chaldean church is an Eastern-rite denomination that recognizes the authority of the pope and is aligned with the Roman Catholic Church. Chaldean Catholics make up a tiny minority of the current Iraqi population but are the largest group among the less than 1 million Christians in Iraq, according to last year’s International Religious Freedom Report from the U.S. State Department.