Bomb in Pakistan kills 2 on election day

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Supporters of Pakistan Tehreek-e-Insaf or Moment for Justice party attend an election campaign rally in Islamabad, Pakistan, Thursday, May 9, 2013. Pakistan is scheduled to hold parliamentary elections on May 11, the first transition between democratically elected governments in a country that has experienced three military coups and constant political instability since its creation in 1947. The parliament's ability to complete its five-year term has been hailed as a significant achievement. (AP Photo/Anjum Naveed)

KARACHI, Pakistan (AP) — A Pakistani police officer says two people were killed when a bomb exploded outside a political office in southern Pakistan on election day.

Shabir Hussain said 20 people were also wounded in the blast Saturday in the port city of Karachi.

The bomb hit the offices of the Awami National Party. It is one of three secular, liberal parties that have been singled out by Taliban militants.

The blast marred a historic day in Pakistan, where voters are coming out in droves to elect a new government.