He said forensics teams were exhuming the suspected graves to search for bodies.
The finding follows a similar discovery earlier this month by police in Thailand who unearthed dozens of bodies from shallow graves on the Thai side of the border. The grim discoveries are shedding new light on the hidden network of jungle camps run by traffickers, who for years held people captive while extorting ransoms from their families.
Satellite photos show possible mass graves near Mariupol