NEW DELHI: BJP MP Subramanian Swamy on Monday accused the Chandigarh Police of doing a "somersault" on a case involving the Haryana BJP chief's son, accused of stalking a woman, and said he would file a PIL in the Punjab and Haryana High Court for a court-monitored CBI probe into the incident.

"With my associate lawyer AP Jagga on attempted abduction of an IAS officer's daughter by two drunk goons, I will file a PIL in Chandigarh," he tweeted.

Asked what prompted him to file a Public Interest Litigation, the Rajya Sabha member said it appeared the Chandigarh Police was in no position to conduct "a fair and free" probe.

The police, he claimed, had first filed non-bailable offences against the accused and then "withdrawn them all and let him (accused) go after having caught him red-handed".

"Hence This matter should be court-monitored and the CBI should be asked to take it over. You can have an SIT if you want, other agencies also. This is my prayer," he said.

The woman had on Friday night called the police up, complaining that two men had chased her along a stretch of over five kilometres in Chandigarh.