Insurgents killed 38 people in a series of rapid-fire attacks Thursday, including three suicide car bombings within an hour and a drive-by shooting at a busy Baghdad market that ratcheted up the bloody campaign to undermine Iraq's government. Iraq's interior minister, meanwhile, claimed the government offensive seeking to root out rebels in Baghdad had scored big gains, saying this week's sweep by Iraqi soldiers and police captured 700 suspected insurgents and killed 28 militants.