(CNN) -- A pro-al Qaeda group responsible for a previous armed assault on the U.S. Consulate in Benghazi is the chief suspect in Tuesday's attack that killed the U.S. ambassador to Libya, sources tracking militant Islamist groups in eastern Libya say.
MORE: http://www.cnn.com/2012/09/12/world/africa/libya-attack-jihadists/index.html?hpt=iaf_c2
