British counter-terrorism police arrested the childhood friend of one of the men suspected of brutally murdering a soldier on the streets of London.
Abu Nusaybah was arrested minutes after giving an on-air interview to the BBC.
He said British intelligence officers had asked his friend, suspect Michael Adebolajo, to work for them.
Police say Nusaybah is suspected of conspiracy to murder, though he is not charged.
Two suspects are in custody for that stabbing attack Wednesday.