Iraq blasts hit Shiite mosque, pilgrims; 37 killed

"BAGHDAD - A suicide car bomb devastated a Shiite mosque in northern Iraq, one of a series of attacks Friday that killed at least 37 Shiite pilgrims and worshippers, police and medical officials said. The incidents are the latest in a series that have targeted Shiites, raising concerns that insurgents are stepping up attacks, hoping to re-ignite sectarian violence that nearly tore the country apart in 2006 and 2007. Though violence has dramatically declined in Iraq in the past two years, U.S. officials have repeatedly called the security gains fragile and cautioned that a waning insurgency still has the ability to pull off sporadic, high profile attacks. "