A small cage is seen at an abandoned migrant camp used by people-smugglers in a jungle at Bukit Wang Burma in the Malaysian northern state of Perlis. Bangkok: The horror of Malaysia's jungle death camps has been revealed. Photographs show make-shift bamboo prisons on stilts with mesh walls and coils of barbed wire Along a steep path strewn with clothes and food wrappings a low cage had been built, too small for a person to stand-up in. "These structures were believed to be used as human cages," said senior Malaysian policeman Mohammad Bahar Alias. The scene described by journalists taken to the camps along Malaysia's northern border with Thailand by police has shocked many Malaysians .Police have found 140 shallow graves at 28 people smuggler camps strung along a 50-kilometre stretch of the border in Malaysia's Perlis state, far more extensive that Malaysia announced on Sunday. Late on Tuesday police exhumed the first of what are believed to be hundreds of Rohingya Muslims fleeing persecution in Myanmar and Bangladeshi migrants. The grisly discoveries have exposed a hidden network of jungle camps run by ruthless people smugglers who held migrants and asylum seekers captive while extorting money from their relatives. If money was paid the captives were allowed to enter Malaysia where many ended up working as cheap unregistered labourers. But many others disappeared and mass graves on both sides of the Malaysia-Thai border now reveal their fate. "If an individual's family did not pay, those staying long in camps were tortured, beaten and deprived of food," Mr Millman said. An Associated Press reporter saw a tiny orange slipper partly buried on a slope at one of the Malaysian camps, indicating children were held there. Police said the camp could hold 300 people.