Armed police have arrested four men on suspicion of plotting an Islamic terror attack on the streets of London.
The raids carried out in central and west London come amid fears that jihadists are returning from Syria to carry out beheadings on British streets.
The suspects are said to be aged between 20 and 21 including one man who recently returned from Syria.
No bullets were fire but one suspect was tasered. All are being questioned in central police stations.
The Metropolitan Police said counter-terrorism officers arrested the men ‘on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism’.
Sir Bernard Hogan-Howe, head of the Metropolitan Police, described the case as ‘quite serious’.
Experts say jihadists are returning from Syria to carry out beheadings on British streets.
Jake Tupman has more from Scotland Yard, where it has announced the men are being held on suspicion of the "commission, preparation or instigation of act of terrorism."