He said on Tuesday that more soldiers had been sent to the borders to control the influx of illegal migrants.
He went on to say that the government was monitoring the situation to decide whether lockdown measures should be applied again, adding that people should not panic.
Prawit said there were several natural routes connecting Thailand with neighbouring countries and they had to be blocked.
As for corruption, he said he does not believe any officials will have accepted money to let illegal migrants cross the borders.