British Police stormed addresses across London and arrested the males – aged between 15 and 19 – on suspicion of the preparation of terrorist acts.
The Metropolitan Police did not specify if the arrests were in connection with ISIS, but said they "relate to plans to travel to join a proscribed organisation". Officer from the Met's counter-terror unit stormed homes in south London on January 14 and arrested two males – aged 16 and 17.
On the same day, houses in west London were raided and police arrested two men aged 17 and 19 . And on February 20 another residential property was stormed and a 15-year-old boy was arrested. Police remain at the scene and are searching the house.
All five suspects have been detained on suspicion of Preparation of Terrorist Acts contrary to Section 5 of the Terrorism Act 2006. 

Source: QNA