Thai police said on Tuesday they had "shown sincerity" and wrapped up the country's biggest investigation into human trafficking, as rights groups questioned whether they had even scratched the surface.

Thailand began a crackdown on trafficking networks and suspected camps hidden deep in its jungle-carpeted mountains last month following the discovery of more than 30 bodies buried in camps in the south.

Police have arrested 56 suspects - including politicians, police, government officials, businessmen and an army general - and issued arrest warrants for 63.

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