Former Goa Chief Minister Digambar Kamat was questioned for around eight hours on Thursday by Enforcement Directorate officials in connection with the Louis Berger bribery case.
An official told reporters that Kamat was quizzed at the ED office here regarding a contract granted to the New Jersey - based consultancy firm, accused of bribing several Congress leaders and bureaucrats.
"He is also being questioned about his file notings as well as then Public Works Department Minister Churchill Alemao, " the official said.
Kamat, who also spoke to the media at the ED office after questioning, said he was cooperating in the probe.
"The ED had summoned me regarding a raid at my house some days ago and seizures made thereof, " the Congress leader said.
Kamat was the Goa Chief Minister when the US firm was granted a contract to oversee the implementation of a Rs 1, 031 crore water and sewage augmentation project funded by the Japan International Cooperation Agency.
Alemao, senior PWD official Anand Wachasundar and head of Louis Berger India Satyakam Mohanty have been arrested in the case.