The Thai Embassy in Malaysia has alerted immigration authorities in both countries after hundreds of visa stamps went missing, saying that they could be used for illegal purposes, Thai Foreign Ministry deputy spokesman Jakkrit Srivali said Thursday.

Thai immigration authorities have found a total of nine suspicious entries by foreigners suspected of using the stolen stamps. Three Pakistanis, two Iranians and two Indians were arrested at the Suvarnabhumi Airport for allegedly using falsified entry documents.

Read more: The Nation