KHARTOUM : Veteran Sudan Islamist opposition leader Hassan al-Turabi, one of the fiercest critics of President Omar al-Bashir's government, died of a heart attack on Saturday aged 84, state television said.

"The Islamist intellectual Hassan al-Turabi has died," the state broadcaster said. It interrupted its regular programming and broadcast Islamic verses from the Koran that are recited for the dead.

A medical source earlier told AFP that Turabi was taken to the intensive care unit of Khartoum's Royal Care hospital "after suffering a heart attack in the morning and died" there. In the evening, an ambulance carrying his body left the hospital for the Turabi family home in the city, an AFP correspondent said. A key figure in Bashir's regime for a decade after his 1989 coup, Turabi later became one of its fiercest critics and led the opposition in urging a Tunisia-style uprising.

He was detained in May 2010, a month after Sudan's first competitive polls since 1986 for denouncing the election as fraudulent.

Turabi was the only Sudanese politician to support a warrant issued for Bashir's arrest by the International Criminal Court (ICC) on charges of war crimes, crimes against humanity and genocide over the regime's conduct of the conflict in Darfur. After breaking ranks with Bashir he formed his own party, the Popular Congress Party. Turabi was detained several times over a career spanning four decades, including in January 2009 two days after he urged Bashir to surrender to the ICC.