Mass graves and suspected human trafficking detention camps have been discovered by Malaysian police in towns and villages bordering Thailand.
Home Minister Ahmad Zahid Hamidi said officials are determining whether the graves were of human trafficking victims, but did not say how many dead bodies were discovered.
According to media reports, the mass graves were believed to contain bodies of hundreds of migrants from Myanmar and Bangladesh.
Police discovered 30 large graves containing the remains of hundreds of people in two places in the northern state of Perlis, which borders Thailand, the Utusan Malaysia newspaper reported.
The Star newspaper reported on its website that nearly 100 bodies were found in one grave on Friday.
Mr Ahmad Zahid said that the camps identified are in the areas of Klian Intan and villages near the border.
A police spokeswoman declined to comment saying a news conference on the issue would be held tomorrow.
A police official said police commandos and forensic experts from the capital, Kuala Lumpur, were at the site but it was not clear how many graves and bodies had been found.
Northern Malaysia is on a route for smugglers bringing people to southeast Asia by boat from Myanmar, most of them Rohingyas, who say they are fleeing persecution, and people from Bangladesh seeking work.
Smugglers have also used southern Thailand and Utusan Malaysia and police believe the discovery had a connection to mass graves found on the Thai side of the border earlier this month.
Twenty-six bodies were exhumed from a grave in Thailand's Songkhla province, over the border from Perlis, near a camp with suspected links to human trafficking.
More than 3,000 migrants, most of them from Myanmar and Bangladesh, have landed on boats in Malaysia and Indonesia this month after a crackdown on trafficking in Thailand.
