an intermediary: 'How many people this one bomb can kill or injure?'

He added: 'His internet searches show he is searching busy places in London. Oxford Street, upcoming events in London. He is looking at internet searches. Where are soldiers in the UK, London's top ten most crowded boroughs, Buckingham Palace, Royal Marines Reserve, City of London.'

A teenager is accused of planning to carry out a terror attack at landmarks such as Buckingham Palace

It is believed Oxford Street is among the targets Ali-Syedi is alleged to have planned to hit

District Judge Elizabeth Roscoe remanded Ali-Syed in custody and ordered him to appear at the Old Bailey next Monday.

Ali-Syed is one of three men arrested during dawn raids and searches by unarmed officers in London and the Home Counties lastThursday. No weapons or bomb-making materials were recovered in the operation.

A second man, aged 20, was also held in west London on suspicion of preparing a terrorist act and failing to disclose information regarding an act of terrorism.

A third man, aged 19, who is originally from Mosul, Iraq, was arrested on suspicion of a religiously aggravated offence.

Both men were released on bail. Just three months ago, Met Police Commissioner Sir Bernard Hogan-Howe warned it is a case of 'when, not if', the UK will be hit by Islamic State-inspired terrorists.

Ali-Syed appeared during a short hearing at Westminster Magistrates court today

The force is arresting a terrorist suspect every day and recently unveiled elite teams of motorcycle gun cops whose job is to foil a marauding attack.

Born in Ealing, west