Lucknow, July 11 (IANS): An IPS officer on Saturday filed a police complaint saying Samajwadi Party supremo Mulayam Singh Yadav threatened him over telephone to mend his ways or face dire consequences.

Amitabh Thakur, posted as Inspector General (Civil Defence), told police at the Hazratganj police station that he received a call from Mulayam Singh on Friday evening.

Thakur's wife in an e-mail to media persons attached a voice recording where a man -- alleged to be Mulayam Singh -- asks Thakur not to be a 'loose cannon' and say anything about anybody.

"I have sympathies with you... have met your parents in Patna where they asked me to take care of you... don't do this," the man tells Thakur.

The Indian Police Service (IPS) officer alleged that it was Yadav's landline number from his house at Vikramaditya Marg of Lucknow.

The official's wife, who is a social activist, said he came under fire because she had filed a police complaint against state Mining Minister Gayatri Prajapati that allegedly incensed the former chief minister.

Police said they will have to check the veracity of the charges.