A REWARD of £13,000 has been offered as Thai police try to find the killers of two British tourists.

Murder detectives launched a hunt after David Miller, 24, and Hannah Witheridge, 23, were found dead on the island of Koh Tao on September 15.

A group of Thais who had been playing football have become the latest to be questioned by detectives. DNA samples have been taken from "more than eight" of the group who reportedly threw a party at the nightclub where the victims spent their final hours.