KABUL: A man suspected of links to the kidnapping of three United Nations workers died in Afghan police custody after his arrest and there were indications he was tortured, officials said on Saturday. Kachkol, who goes by one name, from Zarshakh village in Paghman northwest of Kabul died of a heart attack, a high-ranking police official told AFP on condition of anonymity. "I'm aware that Kachkol has died in police custody but I don't how — it was said that he was suffering from heart problems," he said. However, a United Nations official who has been closely monitoring the case told AFP there were indications that "the man died of torture besides suffering heart problems." "There are indications that he was tortured before he died on November 12," the official who also asked to not be named told AFP. Afghanistan's Independent Human Right Commission has launched an inquiry into the death of Kachkol and expects to release the results Monday. "We are investigating the case right now," human rights commissioner and spokesman Nader Ahmad Nadery said, declining to give further details. Earlier Saturday a US military spokesman expressed hopes that the three hostages would be released unharmed.