He has been remanded in custody until another court hearing is held

He is accused of planning a mass-

A young Muslim man is accused of attempting to buy guns and a suicide vest for an Islamic State-inspired massacre at Buckingham Palace.

Haroon Ali-Syed, 19, was arrested by counter-terrorism officers amid fears he was on the brink of committing an atrocity.

The IT student is also suspected of trying to contact a bombmaker to build a nail bomb, and researching an Elton John concert in Hyde Park which took place on Sunday to mark the anniversary of the September 11 attacks.

Haroon Ali-Syed, 19, from Hounslow in west London, pictured in a court sketch, was arrested last week on suspicion of a terror offence

Ali-Syed is said to have researched this Elton John concert in Hyde Park on September 11

He is charged with planning to carry out an attack at a central London landmark, potentially Buckingham Palace or Oxford Street.

It is understood evidence against Ali-Syed was gathered in a joint operation between MI5 and Scotland Yard.

An undercover officer, posing as an extremist, infiltrated his circle and allegedly recorded exchanges of him preparing a terrorist attack.

Ali-Syed is accused of attempting to get hold of an improvised pressure cooker bomb built to instructions published online by Al Qaeda.

He allegedly made applications for loans worth £8,000 to finance his plans.

Yesterday, he appeared at Westminster Magistrates' Court charged with preparing an act of terrorism between April 12 and September 9.

Prosecutor Thomas Halpin said Ali-Syed tried to contact someone online 'to make an incendiary explosive device,' asking 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 last Thursday. 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 London, Ali-Syed is one of three brothers. His family has links to Slough, High Wycombe, Southall and Hounslow.