BAGHDAD — A female suicide bomber wearing a black abaya detonated her explosives belt in a crowd of about 200 police recruits northeast of Baghdad today, killing at least 16 people.

The woman walked into the crowd at the main gate of the Muqdadiyah police station. At least 16 people were killed and 33 wounded.

Meanwhile, U.S. and Iraqi army forces were engaged in fierce fighting with gunmen in two Sunni-dominated neighborhoods of the capital, Fadhil and Sheik Omar, police said.

Police said one person was killed and 14 wounded in the crossfire. Repeated artillery fire rang out across Baghdad at midday today, but the target was unclear.

The U.S. military today announced the deaths of four U.S. soldiers — three killed by a roadside bomb in Baghdad and another killed in combat in western Anbar province.

The three were killed Monday by a roadside bomb while on patrol in a southeastern section of the Iraqi capital.

ATHENS, Greece — Greek rescuers will deploy a robot submarine to search for the bodies of two French tourists believed to have drowned when a cruise ship sank off a resort island in the Aegean Sea last week.The ship's captain has blamed Thursday's accident on sea currents that swept the Sea Diamond onto a charted reef off the island of Santorini, tearing a hole in the ship's hull. Nearly 1,600 people were rescued before the 469-foot vessel sank.An oceanographic vessel is expected to arrive on the island today to deploy the unmanned sub in an attempt to locate the missing passengers and the ship's voyage data recorder.Jean-Christophe Allain, 45, and his 16-year-old daughter, Maud, were believed to have been trapped in a flooded lower cabin when the ship sank. The missing man's wife told authorities she narrowly escaped from the cabin with their son.