Pakistan funeral suicide bomb attack kills 28

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Media captionThe aftermath of the bomb attack

At least 28 people have been killed and 57 others wounded in a suicide bomb attack at a funeral in north-west Pakistan, officials say.

The dead included a provincial MP linked to Imran Khan's PTI party. It is unclear if he was the target.

The bomb blast in Sher Garh town in Mardan district is the bloodiest attack since PM Nawaz Sharif took office earlier this month.

No group has claimed responsibility for the attack.

One witness is quoted as telling Pakistan's Dunya television that hundreds of mourners were attending the funeral of a local businessman when the suicide bomber detonated his device.

"We all fell down after the blast," the witness is quoted as saying. "There were bodies and wounded everywhere."

Image caption Hundreds of mourners were attending the funeral when the bomber struck

The politician who was killed, Imran Khan Mohmand, stood as an independent candidate in elections last month.

But he later lent his support to the PTI, which won control of Khyber Pakhtunkhwa province - close to militant sanctuaries in Pakistan's tribal region.

The BBC's M Ilyas Khan in Islamabad says that the attack poses a challenge to the PTI which has been in favour of holding peace talks with the militants.

Before the election the Taliban were behind a string of attacks on parties and candidates as part of a militant campaign to derail the vote, mostly targeting secular parties.

Imran Khan campaigned on an anti-American platform in which he blamed the CIA's drone programme and the war in Afghanistan for much of the violence in Pakistan. He called for negotiations with the Pakistani Taliban instead of military operations against them.

The PTI was largely spared that violence but the Associated Press news agency reports that Mr Mohmand is the second lawmaker affiliated with the party to be killed since the election.

The party has condemned this latest attack, which comes just three days after 25 people died when militants attacked a bus carrying women students in the south-western city of Quetta and then stormed a hospital treating survivors.