Wearing military uniforms over explosives belts, gunmen held a local Iraqi government center hostage Tuesday in a grisly siege that ended with the deaths of at least 56 people, including three councilmen who were executed with gunshots to the head.

The five-hour standoff in Tikrit, former dictator Saddam Hussein's home town, ended only when the attackers blew themselves up in one of the bloodiest days in Iraqi this year.

First they set fire to the bodies of the three slain Salahuddin province councilmen in a brutal, defiant show of how insurgents still render Iraq unstable — even if it has so far escaped the political unrest rolling across the Arab world.