A look at what's known about Midhat Mursi, a suspected Al Qaeda master bomb maker, based on information from London's Islamic Observation Center and other sources:

BIRTH, EDUCATION — Born in Alexandria, Egypt, around 1953; chemical engineering degree from Alexandria University, 1975.

MILITANT BACKGROUND — Traveled to Saudi Arabia in 1987, and later to Afghanistan to support Islamist anti-Soviet resistance.

ALIAS — Abu Khabab al-Masri, literally "Father of the Trotting Horse."

RECENT ACTIVITY — After the U.S. invasion in 2001, abandoned "Abu Khabab Camp" was found in Al Qaeda's Darunta complex in eastern Afghanistan. Mursi apparently worked at a lab there on chemical and biological weapons.

WANTED — U.S. government posted a $5 million reward for him last year. Some suspect he trained suicide bombers who killed 17 U.S. sailors on USS Cole in Yemen in 2000.

FAMILY — Married to Pakistani woman. Two sons detained by Egypt in 2001 and 2004 may still be held.