MONROVIA (Reuters) - The bodies of slain Liberian opposition politician Samuel Dokie and his wife Janet were found decapitated and burnt near their car outside President Charles Taylor's Gbarnga stronghold, investigators said on Saturday. Health workers had collected the bodies and brought them to the capital Monrovia, they added. The Liberia Council of Churches said in a statement on Friday it held the Taylor administration responsible for the deaths of the couple, who disappeared on November 30. Witnesses said plain-clothed security men detained them. The bodies of two companions, believed to be Dokie's sister and a bodyguard, were found at another spot near Gbarnga. Taylor, a former warlord elected in July multi-party elections, said on Thursday the deaths would not go unpunished. Police said on Friday they had detained at least five suspects who were present when the Dokies were detained. Dokie was a member of Ellen Johnson-Sirleaf's Unity party, a distant runner-up to Taylor and his National Patriotic Party in the elections that ended seven years of civil war. Dokie, once a Taylor ally, and his wife were travelling to a niece's wedding in the north of the country. Taylor launched the war that killed well over 150,000 people in the nation founded by freed American slaves in 1847. He has pledged to ensure respect for human rights.