A second group that says it has links to the al-Qaida terrorist network has claimed responsibility for Thursday's attacks in London.
|Injured tube passengers are escorted away from Edgware Road Tube Station in London following explosion, Thursday|
The same group also claimed responsibility for the March, 2004 Madrid train bombings that killed nearly 200 people.
Just hours after Thursday's bombings, a group calling itself "The Secret Organization of al-Qaida in Europe" issued a statement on another Arabic language Islamist website claiming responsibility for the attacks.
Neither claim has been verified.
Some information for this report provided by AP, AFP and Reuters.