A crime syndicate may have helped four prisoners who staged an "extraordinary" escape from Kerobokan prison before two were caught in East Timor, a Bali police chief says.
Bulgarian Dimitar Nikolov Iliev and Indian Sayed Mohammed Said arrived back in Bali on Saturday after they broke out of the notorious jail on Monday through a hole under the walls.
The escape route, which was also used by Perth man Shaun Davidson, connected to a water tunnel and out to a main street.
Bali's police chief, Inspector General Petrus Golose, said an investigation was continuing into who helped the group escape and how they managed to get to another country.
"We want to know whether there's (a syndicate) to take people out of Bali," he said.
"This escape is extraordinary that they fled abroad.
"We will dig more."
Insp Gen Golose said Bali respected the sovereignty of its neighbour and a bilateral meeting "accelerated" the legal process.
"There has been good cooperation between our police with Timor Leste," he said.
Davidson, 33, and Malaysian national Tee Kok King remain at large.
The two recaptured men were found near a port in East Timor's capital, Dili, on Thursday.
Police seized $US7,000 in cash in their hotel room.
Iliev is serving a seven-year sentence for money laundering and Said is serving 14 years for drug offences.
Davidson, who was sentenced for immigration offences last year after using another man's passport, had just two months and 15 days left to serve.
He was going to be deported to Australia where he is facing a number of drug charges in Perth.
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