Hong Kong customs seized a record 40 kg (88 pounds) of rhino horns worth around 8 million Hong Kong dollars ($1 million) from Johannesburg en route to Vietnam, the latest bust for authorities trying to tackle the rising volume of endangered species trafficked through the Chinese territory.

The seizure came less than two weeks after customs busted a massive smuggling operation from Africa, seizing a record quantity of pangolin scales, along with more than 1,000 ivory tusks.

Customs said the rhino horns were found in two check-in carton boxes, destined for Ho Chi Minh City. Two men were arrested, they said in a statement on Thursday, adding it was a record haul for airline passengers.