Twin bomb attacks on Friday killed at least 13 people outside mosques in northwest Pakistan, where the party of cricket star Imran Khan is forming a coalition government.

Twin bomb attacks on Friday killed at least 13 people outside mosques in northwest Pakistan, where the party of cricket star Imran Khan is forming a coalition government, officials said.

The blasts targeted the two mosques in the Baazdara area of northwestern Malakand region, senior local administration official Amjad Ali Khan told Agence France Presse.

"The two blasts killed at least 13 people and wounded 48 others," Khan said. "Eight of the injured people are in a critical condition," he added.

The bombs were detonated by remote control but information was slow to filter through from the mountainous area where there is no mobile phone coverage.

The attack came just one day after Khan's Pakistan Tehreek-e-Insaf (PTI) party said it was forming a coalition with the right-wing religious Jamaat-e-Islami (JI) and secular Qaumi Watan Party (QWP).

Friday's attack was the deadliest in Pakistan since last Saturday's general election, won by former Prime Minister Nawaz Sharif, giving him an historic third term as head of the center-right Pakistan Muslim League-N party.