London puts additional agents in after assessment

In London additional agents are being used in response to the attack in Manchester.

Mayor Sadiq Khan announced via a message on Facebook that security measures in the capital were stepped up. 'Londoners will see more agents on the street on Tuesday. 'In addition, Khan expressed his sympathy with the victims and relatives. 'London supports Manchester after this barbaric and resentful attack. It's a cowardly act, involving thousands of children and teenagers. ''

The explosion took place outside the concert hall, just after Grande had closed her performance.