According to BBC, Indonesian police are searching for four foreigners who escaped Bali's Kerokoban Prison using a tunnel.
The prisoners were identified as Australian Shaun Edward Davidson, Bulgarian Dimitar Nikolov, Indian Sayed Muhammad and Malaysian Tee Kok King.
Prison governor Tony Nainggolan said he believed the men were still on the resort island.
Prison breaks are common in Indonesia which is dealing with an influx of people arrested for drug offences, BBC said.
The four men were serving jail terms for a mix of drug and fraud offences.