Excerpts from Books and Wikipedia
"London experienced the horrors of suicide bombers the first time on July 7. There were four attacks: three on underground trains--one near Liverpool Street station, one in Edgeware Road station, and one between King's Cross and Russell Square stations--and one on the bus in Tavistock Square.… A previously unknown Islamic group was quick to claim responsibility.… The British were left to ponder how it was possible for ordinary British Muslims to become so alienated from their country that they would commit mass murder." [1001 Days]