He said they were killed on September 27 as government forces were launching a major attack against rebel-held strongholds in Vine Mountain, adding that their graves had not yet been found.
Briton Mark Slater, 28, Frenchman Jean-Michel Braquet, 27, and Australian David Wilson, 29, were taken hostage by the guerrillas during a train ambush on July 26 that left 13 people killed.
No word had been heard about their fate since August 29.
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