By PATRICK QUINN, Associated Press Writer

BAGHDAD, Iraq - Four explosions ripped through Baghdad on Friday, killing at least 28 people and injuring dozens on the eve of Shiite Islam's most important holiday, officials said. It was the deadliest day since Iraq's landmark elections last month. Suicide bombers attacked two Shiite mosques as Friday prayers were ending, another explosion occurred near a Shiite religious procession and a third suicide bomber blew himself up at an Iraqi police and National Guard checkpoint in a Sunni neighborhood.