81.   Authorities said the killer, who used a kitchen knife in the slayings, apparently set fire to the house to cover his tracks.

82.   Authorities said the man apparently set fire to the house to cover his tracks.

83.   Authorities said the unknown killer apparently set fire to the house to cover his tracks.

84.   But Tokyo believes that North Korean secret agents abducted the victims to cover their tracks while fleeing Japan.

85.   Crews had spent days covering train tracks to keep them from being damaged.

86.   Federal investigators say mobsters usually muscle-out legitimate bidders for public works, then subcontract the job piecemeal to smaller firms without even bothering to cover their tracks.

87.   For a man who was the target of an international manhunt, Ocalan was oddly incautious about covering his tracks.

88.   Finding evidence against Milosevic has been hard because the former Yugoslav president has been careful to cover his tracks.

89.   Government prosecutors Monday charged nine Sinhalese soldiers for allegedly raping and killing a Tamil teenager, then murdering three others to cover their tracks.

90.   He also has been the least accessible, covering his tracks so well that even many rebels have been unable to find him, according to Chechen residents.