London 2

Terrorists set off a series of bombs across London's subway system in the financial district and on a bus in the center of the capital, killing at least eight people and shutting down all public transportation.

``It's reasonably clear that there have been a series of terrorist attacks in London,'' U.K. Prime Minister Tony Blair said at the Group of Eight summit, which began today in Gleneagles, Scotland. ``Our determination to defend our values is greater than theirs to impose extremism. Whatever they do, it is our determination that they will never succeed.''

Seven explosions occurred, starting at 8:50 a.m. local time, at financial district Underground stations, including Liverpool Street, Moorgate and Aldgate East, police said. Casualties were on a bus that exploded near Russell Square, a firefighter said. Nobody claimed responsibility for the attacks, which come a day after London was awarded the 2012 Olympics.

Five explosive devices were found on the subway network, an unidentified firefighter said. Explosions were also reported at Kings Cross and Edgware Road stations in central London.