The burial of Benzair Bhutto was today marred by heavy violence across Pakistan as a bitter row broke out over how she died.

As hundreds of thousands mourned the murdered opposition leader, the country's Interior Ministry claimed she had died from hitting her vehicle's sunroof when she tried to duck after a suicide attack.

However, one of Miss Bhutto's aide rejected the government's explanation of her death as a "pack of lies".

Brigadier Javed Cheema, a ministry spokesman, said Miss Bhutto had died from a head wound she sustained when she smashed against the sunroof's lever as she tried to shelter inside the car.

"The lever struck near her right ear and fractured her skull," Mr Cheema said.

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But the explanation was ridiculed by Farooq Naik, Miss Bhutto's top lawyer and a senior official in her Pakistan People's Party.

"It is baseless. It is a pack of lies," he said.

"Two bullets hit her, one in the abdomen and one in the head. It was a serious security lapse."

The dispute came as Pakistani security forces were given orders to shoot on sight in an attempt to curb unrest as millions across the country mourned Miss Bhutto.

The former prime minister and leading opposition figure was laid to rest in her family's mausoleum a day after her assassination by Islamic extremists.

Her simple coffin, draped in the red, green and black flag of her Pakistan People's Party, was greeted by huge crowds at her ancestral grave in the village of Garhi Khuda Bakhsh in the southern province of Sind.

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