DENPASAR, Indonesia--Indonesian authorities have arrested four foreigners for allegedly trying to smuggle drugs onto the resort island of Bali, an official said Monday.

The head of customs at Bali's Ngurah Rai airport, Himawan Indarjono, said the foreigners--two Thai women, one Russian woman and a Frenchman--were arrested earlier this month.

Indarjono said the two Thais were arrested Oct. 13 upon arrival at the airport with a total of 958 grams of methamphetamine concealed under their clothes.

He said that three days later, customs officers nabbed the Russian woman and the Frenchman, who were picking up 22.5 grams of cocaine at a delivery service.

Indonesia has extremely strict drug laws, and convicted smugglers are sometimes executed.

More than 150 people are currently on death row, mostly for drug crimes. About one-third of them are foreigners.

In May, a Frenchman was sentenced to death on Lombok, an island next to Bali, for smuggling 3 kilograms of ecstasy. Last Wednesday, a court in Bali sentenced two Thais to 16-year jail terms for smuggling 2.2 pounds of methamphetamine.