If you're visiting London in the near future, expect delays and intense security especially on public transit — and some disruption to normal life, including cultural events, as the city recovers.

Following the four blasts, virtually all of London's theatres, including the major West End ones, canceled their performances on Thursday. To find out when shows will resume, see www.officiallondontheatre.co.uk/ Many other performances set for Thursday and into the weekend in central London, from rock concerts to opera, were canceled or rescheduled.

Businesses and major museums in central London were closed on Thursday, including the National Gallery on Trafalgar Square in the heart of the city, www.nationalgallery.org.uk. The museum, one of the world's most renowned, and others hope to to reopen Friday, but hours may be variable and visitors should check ahead.

To get Web links for museums and other attractions, go to the London Tourist Board site, www.visitlondon.com

For updates on London in the aftermath of the bombings, the British Broadcasting Corporation's Web site has extensive information: www.bbc.co.uk The BBC site and other British Web sites were deluged after the explosions: "We have had a huge surge in people using the site today," BBC spokeswoman Naomi Luland told Reuters. "We are pretty certain this is going to be our busiest ever day."

Other useful sites for updates include the Web site of Sky News at www.sky.com/skynews and The Independent newspaper at www.independent.co.uk