At least nine people were killed and more than 50 wounded on Tuesday when a suicide bomber attacked an election rally for a party opposed to Pakistan's Taliban movement, police said.
The blast struck a gathering called by senior politicians of the Awami National Party (ANP) in the northwestern city of Peshawar ahead of the May 11 general elections.
The attack underscored the threat posed by insurgent violence ahead of the elections, which would mark the first transition in Pakistan between elected civilian governments.
"It was a suicide attack," senior police official Shafqat Malik said.
A spokesman for the Pakistani Taliban, which has threatened to attack the ANP ahead of the vote, claimed responsibility for the blast.