Benazir Bhutto had been addressing rallies in many parts of Pakistan

Earlier reports said Ms Bhutto had only been injured and taken to hospital.

Ms Bhutto had just addressed a pre-election rally in the town of Rawalpindi when the bomb went off.

At least 15 other people are reported killed in the attack and several more were injured. Ms Bhutto had twice been the country's prime minister.

She had been campaigning ahead of elections due in January.

The BBC's Barbara Plett says the killing is likely to provoke an agonised response from her followers, especially from her loyal following in Sindh Province.

The PPP has the largest support of any party in the country.

Scene of grief

The explosion occurred close to an entrance gate of the park in Rawalpindi where Ms Bhutto had been speaking.

The blast caused carnage

Wasif Ali Khan, a member of the PPP who was at Rawalpindi General Hospital, said she died at 1816 (1316 GMT).

Supporters at the hospital began chanting "Dog, Musharraf, dog", referring to President Pervez Musharraf, the Associated Press (AP) reports.

Some broke the glass door at the main entrance to the emergency unit as others wept.

A man with a PPP flag tied around his head could be seen beating his chest, the agency adds.

An interior ministry spokesman, Javed Cheema, was quoted as saying by AFP that she may have been killed by pellets packed into the suicide bomber's vest.

However, AP quoted a PPP security adviser as saying she was shot in the neck and chest as she got into her vehicle, before the gunman blew himself up.

Return from exile

The killing was condemned by the US and Russia, and a statement is expected shortly from the UK.

The killing undermined reconciliation in Pakistan, the US state department said.

Ms Bhutto returned from self-imposed exile in October after years out of Pakistan where she had faced corruption charges.

Her return was the result of a power-sharing agreement with President Musharraf in which he granted an amnesty that covered the court cases she was facing.

Since her return relations with Mr Musharraf had broken down.

On the day of her return she led a motor cavalcade through the city of Karachi. It was hit by a double suicide attack that left some 130 dead.

Earlier on Thursday at least four people were killed ahead of an election rally that Pakistan's former Prime Minister Nawaz Sharif was preparing to attend close to Rawalpindi.

(BBC)

MAY HER SOUL REST IN PEACE!!