A chilling reminder of the deadly attacks of two weeks ago in London, England Thursday. But this time, no fatalities and only one reported injury in the explosions. Police in London say the three incidents Thursday in the subways and one on a bus could have been far worse. Some of the explosives apparently didn't go off. British Prime Minister Tony Blair is calling on the people of London to "react calmly" and to "continue with our business as much as possible. "It was July 7 that four bombs in London's mass transit system killed 56 people and injured more than 700 others. Al Qaeda members were linked to the first attack.