21.   The previously unknown group claiming to hold Pearl called itself the National Movement for the Restoration of Pakistani Sovereignty.

22.   Only one, Pius Lustrilanang, has gone public with an account of his experiences, including torture, at the hands of an unknown group.

23.   Police had said the most serious threat came from a previously unknown group which threatened to set off a bomb Saturday night.

24.   A day earlier, a previously unknown group calling itself the Nationalist Kurdish Revenge Forces threatened attacks in a statement carried by a pro-Kurdish news agency in Germany.

25.   A balloting center was destroyed Tuesday when an unknown group tossed a grenade at it, said police in the southern town of Beliatte.

26.   A little-known group, the Islamic Change Movement, and an unknown group, the Tigers of the Gulf, both claimed responsibility for the bombing.

27.   A London-based Arabic newspaper said an anonymous caller had claimed responsibility for the bombing on behalf of a previously unknown group.

28.   A previously unknown group calling itself the Belarusian Liberation Army claimed responsibility for the blast in numerous calls to Belarusian national newspapers and foreign media organizations.

29.   A previously unknown group calling itself the Jordanian Islamic Resistance claimed responsibility for the attack.

30.   A previously unknown group came forward Wednesday and said it staged the attack as a protest against sexism.