WARNINGS to graveyard cleaners not to force worshippers to pay for their services during the Ching Ming Festival appeared to have been heeded last night. People found loitering yesterday morning at cemeteries in Tsuen Wan and Wo Hop Shek offering cleaning or restoring services - sometimes against customers' wishes - had been warned to behave, police said. Chief Inspector of the anti-triad squad in Kwai Tsing, Chau Chi-hung, said five men found in the Tsuen Wan cemetery might belong to triad gangs. But he said it was unlikely they were controlled by criminal organisations. 'These people usually have triad background or are drug addicts,' he said. He said there had been no plans to prosecute them unless they tried to extort money from people. Chief Inspector Chau said some of the cleaners had been warned last week of the intended police presence and did not turn up. Last year, five cleaners were arrested for harassing worshippers for money. They were released after witnesses refused to give evidence.