British police officers walk past tourists in the pouring rain in central London, 30 Jun 2007

Britons appear to have shrugged off new terror threats and are carrying on with their weekend plans, despite increased security that follows the discovery of two car bombs in London Friday.

Clubs and restaurants near where the bombs were found were open, and stores were packed with shoppers.

British authorities searched cars arriving for the tennis championship under way at Wimbledon, and they reviewed security plans for a concert at Wembley Stadium in honor of Princess Diana Sunday.

London Mayor Ken Livingstone insisted it is safe for people to walk around the streets. He and his family were expected to join thousands of people marching in an annual gay pride parade through a part of London were the car bombs were found.

Investigators have reviewed video from security cameras to see if they can learn who drove and then abandoned the two Mercedes sedans. The cars were filled with nails and canisters of gasoline and propane.

Government officials have been holding emergency meetings to figure out how to deal with the situation.

The head of London's anti-terrorism police, Peter Clarke, said the first car bomb was found outside a crowded night club, where a blast could have resulted in many fatalities and injuries.

A second car parked illegally in the area was towed to an impound lot where police discovered that it also contained fuel canisters and nails. Clarke said the two incidents are clearly linked.

Next week, Britain marks the second anniversary of the July 7 London transit bombings, in which four Muslim suicide bombers set off explosions that killed 52 bus and subway passengers.

Some information for this report was provided by AFP, AP and Reuters.