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There have been rising concerns of risks to public health from the tonnes of uncollected waste, including from rats attracted by stacks of bin bags on residential streets.

The rats are trained to sniff out chemicals that are found in landmines and other weapons abandoned on battlefields.

The pest controller advised residents to store their rubbish in outdoor sheds with hard floors so the rats were unable to get through.

The petition found that Red No. 3 causes cancer in male laboratory rats exposed to high levels of the dye.

When the rats come up from the sewers, he said, a tap of the sticks would make them scatter.