71.   But it was reportedly claimed Thursday by a hitherto unknown group calling itself the Palestinian Islamic Revolutionary Army.

72.   But most cases involve previously unknown groups, and authorities usually cannot even confirm such groups exist.

73.   Eight members of a previously unknown Muslim militant group confessed to carrying out bombings against security agencies and public places, officials said.

74.   Fliers from an unknown group called MRA were found near the blast outside Congress.

75.   Goncharik cited leaflets allegedly distributed by a previously unknown group called the Belarus Liberation Army calling for violent street riots after voting Sunday.

76.   He said it was in response to an alleged attempt by an unknown group to enter the compound.

77.   Hindu rightists deny responsibility for the attacks, saying they are part of a campaign by unknown groups to besmirch and perhaps bring down the BJP government.

78.   However, he was believed to have sent facsimiles to news media claiming responsibility in the name of a heretofore unknown group, Lashkar-e-Umar.

79.   In an anonymous telephone call to a newspaper, a previously unknown group calling itself the Angry Proletariats claimed responsibility for the attack, police said.

80.   In early July, a previously unknown Kashmiri rebel group calling itself Al-Faran kidnapped six Western tourists hiking through the Himalayan mountains in Jammu-Kashmir.