ISLAMABAD: Pakistan's elected leaders on Saturday came under mounting pressure to resign in the wake of a US commando operation that killed Osama bin Laden not far from the capital Islamabad.

Navy SEALs in three helicopters raided a three-storey house in the garrison city of Abbottabad last Sunday night, killing bin Laden and flying off with his body, which was later buried at sea.

As the covert operation piled embarrassment on Pakistan's civil and military leadership, the leader of the parliamentary opposition demanded that President Asif Ali Zardari and Prime Minister Yousuf Raza Gilani resign.

“The operation tramples on our honour and dignity, and the president and prime minister must either give an explanation or resign,” Chaudhry Nisar Ali told reporters.

“The government is keeping silent and there appears to be nobody to respond to propaganda against Pakistan,” he added, saying that people in the country were feeling “insecure” after the covert US mission.

The fact that bin Laden was living in a garrison city less than a mile from a top military academy has fanned US suspicions that elements of Pakistan's intelligence services may have known his whereabouts and been protecting him.

“Those who are responsible must admit and quit,” said Ali.

He also criticised the country's powerful intelligence agencies, saying that Pakistani institutions had “deviated from their real role”.