Indonesia is to deport three Britons and one Australian, who have been working in Southeast Sulawesi province, for immigration violation, head of the provincial immigration office Ade Endang Dahlan said Thursday.

The three British instructors of marine conservation, who entered the province since 1999, have breached from the immigration rules since January last year, said Dahlan.

The three Britons, who have only got work permit in one environmental foundation, have worked with other foundations, he said.

"They worked in other companies, getting fee, it is not allowed," Dahlan told Xinhua over telephone from the province. "They must be deported because of this violation. Hopefully this week they can be sent home."

Dahlan said the violation was found in December last year and has been under investigation since.

He said another target of his office was an Australian citizen who remained in the province after his sponsorship expired. The Australian is currently staying overseas and will be investigated after his return and sent home, he said.

Indonesia implements firm rules of immigration. In last September, five Australian journalists were deported from the easternmost province of Papua for misuse of visa facilities.

Source: Xinhua