"He is completely shattered and is repenting for what he had done," Assistant Commissioner of Police Dilip Suryavanshi said.
Srikant Shivade, Ahuja's lawyer, said if the actor has given any statement to the police on his alleged role in the crime, it would not have evidential value in court.
"We will wait until the chargesheet is filed," Shivade said.
"Ahuja has not been sleeping well in the lock-up and even skipped dinner on Monday night," a police officer said.
Ahuja reportedly told the police it never occurred to him that the crime he was committing was "so serious."
"He thought the victim would keep quiet and not complain to anyone," the officer added. "Though the actor was uncomfortable during interrogation, he answered many of our questions."
Ahuja is in police custody till Thursday, June 18.