The four Indian workers kidnapped in Sudan are expected to be released by Sunday, officials said in New Delhi.

Negotiations for release of the hostages are progressing well, the officials told PTI, adding they could be free in a day or two.

P K Abhilash, Mohd Aseeb Shaikh, Biplab Biswas and Surjeet Singh, working for a private oil company Petro Energy Contracting Services, were abducted on Tuesday suspectedly by local gangs in oil-rich Heglig area in southern Sudan.

Kidnappers were soon identified and negotiations opened through various channels.