Iraqi officials say a pair of bombs have exploded outside a government building north of Baghdad, killing at least 35 people and wounding many others.

The officials said a car bomb and another explosive went off Tuesday in the town of Taji, about 20 kilometers north of the capital. There was no immediate claim of responsibility for the bombings.

In another attack, officials said a rocket hit Baghdad’s fortified Green Zone late Monday, killing at least four people.

Violence in Iraq has dropped sharply since the peak of sectarian violence in 2006 to 2007, but Sunni insurgents and Shi’ite militias continue to carry out bombings and other attacks, many targeting Iraqi security forces.