BRISBANE (Reuters) - Australian police on Thursday widened their search for five men, including three convicted murderers, who escaped from a Brisbane prison. Queensland police spokesman Brian Swift said more than 150 officers had been put on the case which had already become the largest manhunt in the state's history. "We are actively working on 101 separate pieces of information and have 101 lines of inquiry," Swift told a news conference. "We are now looking in other parts of the state as well as around the city." Swift said police believed the five men had split into two separate groups but had no idea of the men's whereabouts since they broke out of a high-security prison using diamond-encrusted wire to cut through the fence. "There has been no significant development in the overnight search for the escapees," Swift said. "We believe the escapees have broken into two groups but we have no real idea where they are." Dozens of police wearing flak jackets have been involved in the search for the men, described as "the most dangerous and desperate people on the streets of Australia at the moment". "People in the south-western suburbs of Brisbane are being warned today to stay alert," Swift said. "A full-scale large search continues. It's a major, major exercise," he said.