Anti-terror police have launched an investigation after two car bombs were discovered in central London. Here is how events unfolded on Friday.
0125 An ambulance crew is called to the busy Tiger Tiger club in Haymarket to treat a sick person. While there the crew noticed what resembled smoke, or possibly vapour from the petrol in the car, coming from a metallic green Mercedes outside the club.
0200 Police cordon off the area while explosives officers examine the vehicle.
0230 A blue Mercedes 280E is found parked illegally in Cockspur Street, near Trafalgar Square, not far from the discovery of the first car.
0330 The blue Mercedes is taken to a car pound in Park Lane. Police manually disable a device in the green Mercedes, preventing what police sources said could have been "carnage".
0400 A witness sees police removing gas canisters from the green Mercedes.
1000 Prime Minister Gordon Brown says Britain faces "a serious and continuous threat" and the public needs "to be alert" at all times.
1025 The green Mercedes is removed from Haymarket.
1030 Government emergency response committee Cobra meets.
1430 Park Lane is closed off as police investigate the second car. The road was eventually reopened five hours later.
2045 Police confirm the second car contained bomb material. Both vehicles were packed with nails, petrol and gas cylinders.
All times BST