A powerful bomb tore through a bus carrying government workers in restive northwest Pakistan on Friday, killing at least 18 people, officials said.

More than 40 others were wounded in the attack on the bus hired by the Khyber Pakhtunkhwa provincial government to take staff home from work.

A twin suicide bombing killed at least 78 people at a church service in northwest Pakistan on Sunday in what is believed to be the deadliest attack on Christians in the country.

The two attackers struck at the end of a service at All Saints Church in Peshawar, the main town in Khyber Pakhtunkhwa province, which has borne the brunt of a bloody Islamist insurgency in recent years.

A car bomb hit a Pakistani refugee camp Thursday, killing 13 people including women and children, raising further fears for the security of a May general election in the nuclear-armed state.

More than 30 other people were wounded when the bomb exploded in Jalozai, the largest refugee camp in Pakistan, as scores of people queued for rations handed out by a local charity in partnership with the United Nations and USAID.

A remote-controlled bomb targeting police killed two people in northwest Pakistan Tuesday, police said, hours after a blast near the home of a prominent provincial minister.

The device exploded near a police van carrying six officers outside the main police station in the town of Bannu, in Khyber Pakhtunkhwa province, district police chief Nisar Ahmed Tanoli told Agence France Presse.

A bomb explosion inside a Sunni Muslim mosque on Saturday killed four people and wounded 28 others in Pakistan's northwestern city of Peshawar, officials said.

The explosion took place while people were saying afternoon prayers in the mosque located in the densely populated Mohalla Baqar Shah area of Peshawar city.

Six women and a man working for a Pakistani health and education charity involved in vaccinations were shot dead on their way home from a community center on Tuesday, officials said.

Police said they were investigating whether there was any link to the Taliban or other Islamist militants, who have been blamed for past attacks on charity workers and on health education projects in particular.

A suicide bomber killed a senior provincial minister and seven other people at a political meeting in northwest Pakistan on Saturday, officials said, in an attack claimed by the Taliban.

The bomber struck when the top provincial leadership of the Awami National Party (ANP) had gathered at a meeting in the city of Peshawar, the capital of Khyber Pakhtunkhwa province.

Pakistani doctors on Wednesday removed a bullet from a 14-year-old child campaigner shot by the Taliban in a horrific attack condemned by national leaders and rights activists.

Malala Yousafzai, 14, is in intensive care after being shot in the head in broad daylight on a school bus on Tuesday, in an assassination attempt that has appalled a country where thousands have died at the hands of Islamist extremists.

A bomb ripped through a van in Pakistan's northwestern city of Peshawar on Wednesday, killing nine people and wounding more than 20, officials said.

Officers said it was not immediately clear whether the bomb was planted in the van or at the roadside.

A suicide bomber blew himself up outside a police station in northwestern Pakistan after officers opened fire on him on Wednesday, police said, adding that there were no other casualties.

The incident took place outside Jandol police station in the mountainous Lower Dir district, one of the tribal areas bordering Pakistan where Taliban and al-Qaida militants have strongholds.