The United States confirmed that an American vehicle was attacked in the city of Peshawar in northwest Pakistan on Monday, wounding two American and two Pakistani consulate staff.

The information minister of Khyber Pakhtunkhwa province, Mian Iftikhar Hussain, insisted in the regional parliament that two Americans were also killed, without giving any further details on their identity.

A bomb blast ripped through a Pakistani bus on Friday, killing 19 people, including seven women and a child, on the outskirts of the northwestern city of Peshawar, police said.

More than 40 others were wounded in the attack on a bus rented by the government to take staff home after work in the province of Khyber Pakhtunkhwa.

The United States said Tuesday it was certain a CIA drone strike killed al-Qaida number two Abu Yahya al-Libi, claiming its top scalp from the terror group since eliminating Osama bin Laden.

A U.S. official told Agence France Presse that Washington had a "high degree of confidence" that Libi was killed in a pre-dawn strike in Pakistan's tribal areas on Monday, part of an intense spate of assaults in the region against the terror group.

At least 51 militants and four soldiers have been killed in air strikes and clashes with Pakistani security forces in the restive northwest over the past week, officials said Sunday.

On Sunday, Pakistani planes bombed a tribal belt bordering Afghanistan, killing 26 militants, a senior paramilitary official told AFP.

A bomb killed at least seven people and wounded another 22 on Monday, targeting a public meeting attended by provincial ministers in volatile northwestern Pakistan, police said.

The bomb went off soon after chief minister of Khyber Pakhtunkhwa province, Amir Haider Hoti, and other ministers in his provincial cabinet had left the meeting in the town of Nowshera.

A car bomb ripped through a Pakistani bus station on Thursday, killing 13 people, including two children, on the outskirts of the northwestern city of Peshawar, officials said.

The attack happened on the road towards the garrison city of Kohat near the lawless tribal belt, a stronghold of Taliban and al-Qaida-linked militants blamed for violence plaguing both Pakistan and neighboring Afghanistan.

A suicide bomber killed an Islamist militant commander in Pakistan's northwestern city of Peshawar on Monday, along with at least three other people, police said.

The attack damaged a house that the target, Haji Akhunzada, was building in Pakha Ghulam on the outskirts of Peshawar, Pakistan's main northwestern city that runs into a militant-heavy region on the Afghan border.

A bomb attack on a girls' school in northwest Pakistan on Tuesday killed a policeman, wounded eight others and destroyed a wall, police said.

The remote-controlled bomb was planted at the outer wall of the government-run middle school in the outskirts of Mardan town in troubled Khyber Pakhtunkhwa province, which borders Afghanistan.

A former town mayor, his son and bodyguard were killed and eight other people wounded on Monday when a suicide bomber blew himself up in Pakistan's northwest, police said.

The bomber targeted Hanif Khan Jadoon in Swabi, 90 kilometers east of Peshawar, as he was sitting in his car after offering his Eid prayer.

Seven people were wounded when a small bomb fitted with a timer exploded outside a grocery shop in a busy market in the northwestern Pakistani city of Peshawar on Thursday, police said.

The bomb was packed in an oil canister and placed outside the shop in the city's popular Rampura Market, local police officer Javed Khan said.