"The first reason for attacking political parties is their secular doctrine. The second reason is that they were responsible for burning (the tribal areas), Swat and Khyber-Pakhtunkhwa," Taliban spokesman Ihsanullah Ihsan said in a statement.
The Pakistan People's Party, Awami National Party and the Muttahida Qaumi Movement were responsible for the "displacement of millions of people, the plight of the Pakhtun, for abandoned villages and destroyed mosques" during military operations, he claimed.
The Taliban would avenge the oppressed, he said.
Describing the May 11 polls as "so-called general elections" being held under a secular democratic system, Ihsan said Pakistan "came into being under the banner of an Islamic doctrine, while elections are based on a secular doctrine. The two are contrary to each other because Islamic laws and values come from Allah, while the secular doctrine comes from Rousseau, Kant and Bentham."
Claiming responsibility for a series of bomb attacks on politicians in Karachi, Peshawar, Swabi and Kohat, Ihsan said "a man cannot be secular and a Muslim at the same time".