A firing squad on Monday executed an Islamic militant who killed three American missionaries in a south Yemen hospital in 2002, Yemen's official Saba news agency reported.

Abed Abdul Razak Kamel was shot in the central prison of the southern Ibb province as prison, police and judicial officials watched, the agency reported.

Kamel had been convicted of opening fire on a staff meeting at a Baptist hospital in the southern town of Jibla in December 2002, killing obstetrician and surgeon Martha C. Myers, 57, hospital director William Koehn, 60, and purchasing agent Kathleen A. Gariety, 43.

President Ali Abdullah Saleh had approved the death sentence.

Yemeni officials have said that Kamel may have been linked to the Al Qaeda terror network headed by Usama bin Laden, who has ancestral roots in Yemen. Police found bin Laden audiotapes at Kamel's house.