Railway minister Mamata Banerjee's office has lodged a complaint with Delhi Police against a Bengali TV news channel for continuously flashing her personal mobile number claiming that it affected her working and posed a security threat to her.

The news channel flashed her mobile number during a programme on March 30 prompting her office to approach the Parliament Street police station with the complaint.

J K Shah, executive director (public grievances) to Minister of Railways, has lodged the complaint against the news channel for flashing minister's mobile number continuously with the "intention of disrupting her functioning". The complaint was entered in the daily diary report at the police station on March 31.

A senior police official said no case has been registered so far. "It is not a crime to publicise a number. As of now we have not received any concrete lead. We are investigating the matter," he said.