A complaint has been filed against MNS chief Raj Thackeray at a city police station for allegedly violating the model code of conduct by using “unparliamentary” language against ex-Union minister Shivraj Patil during a campaign speech.

Under the direction of Election Commission observers, the complaint has been lodged at Kothrud police station, police said on Sunday.

According to the complaint filed under various sections of the IPC, Mr. Thackeray used “unparliamentary” language against the former home minister during a rally here on October 8.

The party had also allegedly violated the poll code by putting up its flags on the nearby buildings when the election meeting was held to campaign for MNS candidate Kishor Shinde, police said.