Police: Kenya arrested 1 of London attackers

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5. Guardian story w/more detail:

Woolwich murder: armed police arrest man on north London street

One witness, who did not wish to be named, said: "The guy was on a push bike when the police came out of nowhere and wrestled him to the ground." Two other plain clothes officers – identifiable only because one was wearing a Metropolitan police cap – were nearby. A Scotland Yard spokesman said: "A 22-year-old man was arrested by officers from the MPS Counter-Terrorism Command investigating the murder of Lee Rigby. He has been taken to a south London police station where he remains in custody."