Harin Da Aka Kai a London (Da Dumi-Dumi)

London murder suspect, Michael Adebolajo, shouts slogans at a 2007 protest march. (file photo)

Lee Rigby, of the British Army's 2nd Battalion The Royal Regiment of Fusiliers, was killed May 22 in an attack by two men in Woolwich, London.

A picture of victim Drummer Lee Rigby, of the British Army is displayed with flowers near the scene of his killing in Woolwich, southeast London May 23, 2013.

Mourners weep as they view flowers left in memory of his Lee Rigby outside an army barracks near the scene of his killing in Woolwich, southeast London May 23, 2013.

A police officer carries an evidence bag containing a knife near the scene of the killing of a British soldier in Woolwich, London, May 23, 2013.

Police forensics officers investigate a car at a crime scene where one man was killed in Woolwich, southeast London May 22, 2013.

British forensic officers attend the scene of an apparent attack which has left one man confirmed dead and two people wounded near Woolwich barracks in London, May, 22, 2013.

Police officers guard a cordon set up around a crime scene where one man was killed was killed in Woolwich, southeast London May 22, 2013.

Police forensics officers investigate a crime scene where one man was killed in Woolwich, southeast London May 22, 2013.

A police forensics officer investigates a crime scene where one man was killed in Woolwich, southeast London May 22, 2013.

Police officers carry equipment while investigating a crime scene where one man was killed in Woolwich, southeast London May 22, 2013.