In pictures: London raids

1 of 8 Armed police investigating the 21 July attempted bombings surrounded properties in west London.

2 of 8 The properties were in Dalgarno Gardens, North Kensington and the Tavistock Road area of Notting Hill.

3 of 8 Two arrests were made at Dalgarno Gardens.

4 of 8 Police officers stood near the scene of the armed operation.

5 of 8 The earlier raid took place in the Tavistock Road area of Notting Hill.

6 of 8 A BBC helicopter caught the moment when one of the suspects was arrested. A gun trained on him at all times, he was put into a white forensic suit to preserve evidence and driven away.

7 of 8 A police officer in balaclava head gear and body armour negotiated the Metropolitan Police cordon in Notting Hill.

8 of 8 BBC Correspondent Jane Hughes said: "Police regard this as a very significant event."