Dozens of suspected militants attacked a major power station in northwest Pakistan with mortars and rocket-propelled grenades and killed seven people, police said on Tuesday. The assault, in the run-up to 11 May general elections, destroyed the biggest power station in Khyber Pakhtunkhwa province, suspending electricity supply to half of the major city of Peshawar, according to reuters. It served as a reminder that Pakistan's leaders have failed to tackle a Taliban insurgency that remains potent despite a series of security crackdowns. Pakistan's Taliban, which is close to al Qaeda, has threatened to escalate violence ahead of the polls, including attacks on political rallies.