Suicide bomber targeting police kills 4 people in northwest Pakistan

An injured Pakistani girl cries while getting medical treatment at a local hospital following a bomb blast, in Peshawar, Pakistan on Sunday, April 28, 2013. Pakistani Taliban detonated bombs at the campaign offices of two politicians in the country's northwest on Sunday, police said, killing many people in an escalation of attacks on secular, left-leaning political parties. (AP Photo/Mohammad Sajjad) (The Associated Press)

Pakistani police officers and volunteers visit the site of an explosion in Peshawar, Pakistan on Sunday, April 28, 2013. Pakistani Taliban detonated bombs at the campaign offices of two politicians in the country's northwest on Sunday, police said, killing many people in an escalation of attacks on secular, left-leaning political parties. (AP Photo/Mohammad Sajjad) (The Associated Press)

PESHAWAR, Pakistan – Pakistani authorities say a suicide bomber targeting policemen has killed four people in the main northwestern city of Peshawar.

Liaqat Ali Khan, the city's police chief, says the attack aimed at one of his partol teams on Monday also wounded over 30 people. The bomber detonated his explosives as the patrol passed by.

No one has claimed responsibility for the attack.

Suspicion is likely to fall on the Pakistani Taliban. The group has been waging a bloody insurgency against the government for years and has stepped up attacks ahead of the May 11 parliamentary election.

On Sunday, the Taliban killed 11 people in bomb attacks on a political rally and two campaign offices in the northwest. The group is seeking to disrupt the election.