"The investigation has always remained open and the inquiry team within the Counter Terrorism Command remains committed to identifying those people responsible", said a spokesperson.

BBC: Yvonne Fletcher

The Met Police said a murder inquiry was being led by its Counter Terrorism Command.

BBC: Woolwich machete attack leaves man dead

In the House of Lords, the government was urged by Lord Marlesford to include in the inquiry "the possibility of replacing the top operational command of UKBA with the appointment of retired military officers who have spent their professional lives defending the realm".

BBC: Let army officers look after UK borders, peer urges