In pictures: Security tight for Bush visit

1 of 8 Armed police guard the US embassy in London as security is stepped up for President George Bush's visit

2 of 8 Police have increased the number of officers on duty to 14,000 for President Bush's three-day visit

3 of 8 There is a stand-off between the police and the Stop the War Coalition over which roads can be included in a protest march

4 of 8 President Bush will stay at Buckingham Palace during his state visit

5 of 8 British and American security personnel are working together to make sure the US president's visit goes according to plan

6 of 8 Police check vehicles entering and leaving Tony Blair's home in Trimdon, County Durham, which George Bush is due to visit

7 of 8 The president will travel to Tony Blair's Sedgefield constituency to meet members of the public

8 of 8 Police go through rigorous security checks outside the prime minister's home in Trimdon, Durham