The mastermind of numerous bomb plots in New York in the early 1990s has died in prison in the US, his family says.
Sheikh Omar Abdel Rahman, a blind cleric who preached at mosques in New York, was sentenced to life in 1996 for planning the attacks.
He plotted to attack multiple landmarks in New York with the aim of stopping US support for Israel and Egypt.
He was accused of inspiring the 1993 bombing of the World Trade Center, but was not convicted over that attack.
The judge at his trial said that if his plans had been enacted, thousands of people would have died.
Sheikh Rahman's death was announced in the Egyptian capital Cairo by his family.
Often referred to in the US as the Blind Sheikh, Rahman was also suspected of roles in numerous other violent attacks in Egypt in addition to developing close links with al-Qaeda.
Rahman and nine others were convicted of planning a "war of urban terrorism" in the US which would have culminated in five bombings of prominent New York landmarks including the the George Washington Bridge and the Lincoln and Holland Tunnels.
The prosecution maintained that the 1993 bombing of the World Trade Center was also part of the conspiracy, but neither Rahman nor his co-defendants were formally accused of any role in that attack.
Six people died in the 1993 attack.