Accusing the Pakistan government of trying to spin its way out of the assassination of Benazir Bhutto [Images], her husband and Pakistan People's Party leader Asif Ali Zardari has said that the Pervez Musharraf [Images] regime had the most to gain from the former premier's death.

"I think whoever has to gain from her death, and definitely the sitting government has to gain from her death. They should be held responsible�," Zardari, who was named the co-chairman of his party on Sunday, said.

He described as 'too far-fetched' the government's claims that the Taliban and Al Qaeda [Images] were behind Bhutto's killing and called on US President George W Bush [Images] to ensure that an international investigation is carried out into the December 27 slaying of his wife.

"The government has been trying to put a new spin on it every day, but the latest piece of evidence that has come on the television is a Channel 4 report of the exact way the assassin hit Benazir and the exact position and everything is now very clear that she was shot.

"I had maintained from the first day that she was shot either point blank or by a very high-powered sniper rifle. Now it seems that she was shot nearly point blank by a pistol,"

Zardari said, debunking the government's assertion that Bhutto died due an injury from the sun-roof lever of her car.

"It just proves they have just been trying to muddy the water from the first day," he said in a telephone interview with CNN.

Zardari said his Pakistan People's Party had called for an investigation team under the auspices of the United Nations, the United Nations to be assisted by the British authorities.

"We are going to be writing to the United Nations and we are going to be writing to the British prime minister and British Parliament and we are hoping to lobby in America for their support, too," he said.

Asked if he believed that the government of the president, Pervez Musharraf, was directly responsible for ordering the killing of his wife, he said he will not take any position at the moment as he has asked for an international investigation but maintained that government had failed to provide her adequate security.

"I will wait for the international investigation to come and find out... We had written so many letters to them. We had written, asked for international assistance for security which they did not do. There are so many reasons that I should be apprehensive of the present government," Zardari said, expressing doubts that the assassination could be the handiwork of the Taliban and the Al Qaeda.