A wave of bomb attacks across Iraq killed at least 22 people Sunday.

Two explosions near a Shi'ite Muslim mosque in Baghdad killed 15 people and wounded 60 others. Many of the casualties were caused by a suicide attacker who drove into a crowd of people helping victims of the first bomb, then detonated his vehicle.

A separate roadside bomb blast in eastern Baghdad Sunday killed an American soldier.

To the north, in Tikrit, two suicide bombers killed six people, including four policemen, outside a police academy.

In other developments, Pakistani officials say kidnappers have released a Pakistani embassy employee who was abducted earlier this month in Baghdad.

And, Iraq's political leaders are continuing efforts to form a government. Negotiations among major groups have yet to yield a Cabinet, nearly three months after the country's historic elections, on January 30.

Some information for this report provided by AP.