Mamed Salameh, Ahmad Ajaj, Mahmud Abouhalima and Nidal Ayyad were found guilty in March 1994.

CNN: New York remembers 1993 WTC victims

Mohammed Ayyad, a spokesman for the Palestinian Red Crescent, said both Palestinians the one found Thursday and the one killed during Wednesday's clashes were shot in the chest.

NPR: Gaza Militants Fire At Israel; Palestinian Killed

Two of the defendants, Dibali Abdellah, 32, of Algeria, and Baanou Abdullah, 22, of Lebanon, also corresponded with three men -- Mohamed Amine Salameh, Mohamed Abouhahima and Nidaly Ayyad -- who were serving sentences in the United States for their links to the 1993 attacks on the World Trade Center in New York, the document said.

CNN: 30 accused over Madrid 'bomb plot'