Days after he asked local multiplex owners to screen Marathi movies at prime time or face the music, the Mumbai police has served a notice to Maharashtra Navnirman Sena chief Raj Thackeray, warning him against giving any provocative or inflammatory speeches."A notice under Section 149 of the Criminal Procedure Code was served to Raj Thackeray, warning him against giving any speeches that incite violence," said S R Unavane, senior inspector at Shivaji Park police station.