KUALA LUMPUR, June 23 — Four Thai nationals have been extradited to face charges in Malaysian court in connection with human trafficking at the Wang Kelian transit camps and mass graves in 2015.

The four men were handed to the Malaysian authorities yesterday and arrived at the court complex in Kangar, Perlis at about 8.10 this morning under police escort, The New Straits Times reported today.

The four, believed to be aged between 30 and 58 years, are expected to be charged under the Anti-Trafficking in Persons and Anti-Smuggling of Migrants Act 2007.

Home Minister Datuk Seri Saifuddin Nasution Ismail said the four, who were among 10 Thai nationals sought by authorities here, were extradited yesterday following an order by the Thai Appeal Court.

Saifuddin Nasution added that the extradition was a result of good cooperation between both neighbouring countries with four out of 10 individuals that have been identified in connection with the case.

He said Malaysia sought assistance from the Thai government on January 6, 2017, to extradite 10 Thais following investigations into the incident.

He said the case involving the four went through various court processes in Thailand before concluding in March this year.

In May 2015, police discovered 139 graves and 106 bodies, believed to be Rohingyas, as well as 29 illegal immigrant detention camps deep in the jungles of Bukit Genting Perah and Bukit Wang Burma, a few hundred metres from the Malaysia-Thai border in Wang Kelian.