71.   Authorities blamed a faulty fuse for the incident, which occurred in a downtown tunnel.

72.   Authorities blamed a leaky gas container.

73.   Authorities blamed Basque separatists for the explosion.

74.   Authorities blamed guerrillas of the Revolutionary Armed Forces of Colombia.

75.   Authorities blamed leftist guerrillas.

76.   Authorities blamed local Hutus.

77.   Authorities blamed the accident on heavy rains.

78.   Authorities blamed the attack on the leftist Revolutionary Armed Forces of Colombia, or FARC.

79.   Authorities blamed the attack on the Revolutionary Armed Forces of Colombia, a rebel group founded decades ago that operates mostly in rural areas.

80.   Authorities blamed the Hutu rebels for the killing of a Briton, a Cambodian, two Rwandans and a driver working for the U.N. High Commissioner for Human Rights.