A Cambodian court on Sunday charged three Chinese nationals with money laundering after the men were allegedly caught carrying more than $3.5 million without proper provenance for the money.

The three men were arrested this past week at Phnom Penh International Airport after they arrived from Hong Kong. They were allegedly carrying $3.52 million in $100 bank notes in their bags.

Ly Sophana, a spokesman at Phnom Penh Municipal Court, told reporters that the three men were officially charged with money laundering under Cambodia's Law on Anti-Money Laundering and Combatting Financing of Terrorism.

If convicted, the men could face 10 to 20 years in prison.

According to the National Police website, the three men told police that some of the money was won gambling in Macau, and some was borrowed from relatives. They said the money was brought to Cambodia to invest in real estate.

The men were arrested, however, and the money was confiscated due to not having the proper provenance, the website said.