Teenagers spark UK Parliament alert, arrested

London: Two 15-year-old boys broke into the grounds of the Parliament and were arrested, Scotland Yard said on Tuesday, days after the deadly Westminster terror attack that killed four people.

The Metropolitan Police said the incident was not being treated as "terrorist-related" and the two boys were arrested and have been released on bail until May.

"The boys, both 15-years-old, climbed over a low barrier into the car park at the southern end of the Palace. They then crossed back over into the public area when a police officer approached them. The trespass lasted approximately 30 seconds," the Met Police statement said.

"The boys attempted to run away but were pursued and detained by police. They were arrested on suspicion of trespassing on a protected site, contrary to section 128 of the Serious Organised Crime Act 2005," it added.

The police stressed that the trespasser did not gain access to any building.

The security breach follows Khalid Masood's attack on the Parliament complex at the Palace of Westminster.

Four people died and 50 injured when lone attacker Masood rammed a car into pedestrians on the bridge, before crashing his vehicle and fatally stabbing an on-duty police officer in the grounds of Parliament. Masood was shot dead by police at the scene.