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MOGADISHU, Somalia (CNN) -- He's known as the man behind 2013's ghastly shopping mall siege in Nairobi, Kenya. He's pledged his terror group's allegiance to al Qaeda.
(CNN) -- U.S. military forces conducted an operation Monday in Somalia against the Al-Shabaab network, Pentagon press secretary Rear Adm. John Kirby said.
Here is a Q&A that looks at the al Qaeda-linked militant group: