The two males, ages 16 and 17, were arrested at an address in the West Midlands on suspicion of violating the Malicious Communications Act 1988 and the Computer Misuse Act 2006. Their names were not released.

On Tuesday, a group calling itself TeaMp0isoN posted on YouTube a of a phone call made to the police's Anti-Terrorist Hotline. A male who identified himself as 16-year-old "Robert West" is heard haranguing officers for about five minutes.

The Metropolitan Police Service said in a statement it was confident the group was not able to listen to confidential communications and that its communications systems had not been breached.

"We are satisfied that any recording would have been made via the receiving handset only and not from an attack on internal systems," the MPS statement said.

At one point during the call, the teenager asks a male officer if he'd ever heard of TeaMp0isoN, to which the officer replies: "I've heard about TeaMp0isoN, yeah. Correct me if I'm wrong you but do you hack into certain sites, that sort of thing?"