Police hunting for a terror suspect who gave the security services the slip by leaving a mosque in a burkha disguise have arrested a teenage boy.

Officers from the Met’s Counter Terrorism Command arrested the 17-year-old on Thursday on suspicion of conspiring with another to breach measures in a notice issued under the Terrorism Prevention and Investigation Measures Act 2011.

The suspect Mohammed Ahmed Mohamed left the An-Noor Masjid and Community Centre in Church Road, Acton, dressed in a woman’s full face niqab to escape police last November. He has been linked to the Somali militant group al-Shabaab, which was behind the attack on the Westgate Mall in the Kenyan capital Nairobi on September 21 last year, in which at least 67 people died.

He has breached an order restricting his movements.

Police say he should not be approached but do not believe he poses a direct threat.

The 17-year-old has been taken to a south London police station where he remains in custody.