Indonesia has beefed up security at Nusa Kambangan prison island and closed it to visitors in a sign authorities are preparing to execute people convicted of drug crimes.

The head of prisons in Central Java province said Tuesday that about 1,000 police have been sent to Cilacap, the town nearest the maximum security island, and that preparations on the island are complete.

Local media reports say 14 people, including foreigners, will be executed.

Last year, Indonesia executed 14 people convicted of drug crimes, mostly foreigners, sparking an international outcry.

The government hasn't announced a date for its next executions, or the number of people, but there are indications the death sentences will be carried out within days.

Two death row prisoners have been moved to the island since the weekend.