The Delhi Police on Tuesday enhanced the reward for information on culprits in the Swiss diplomat rape case to Rs 400,000 -- an eight-fold increase.

The reward will come into effect immediately and hold good for one year, Joint Commissioner of Police (Southern Range) Satish Chandra said.

"The reward will be paid to anybody providing information or a clue or render any help leading to the arrest of accused persons involved in the rape," he said. He assured the identity of the informer would be kept secret.

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"The commissioner of police, Delhi, reserves the right to decide finally by whom the reward has been earned and in what proportion it will be distributed among various claimants, in case more than one claimant comes forward for the same," Chandra said.

The 35-year-old diplomat was abducted car by two persons from the parking lot of the Siri Fort auditorium on October 14 when she was leaving after watching a movie at the India International Film Festival. One of the accused then raped her as another drove the vehicle through the streets of South Delhi.