A man was recorded pulling out BN flags along a pavement and throwing them to the ground. The video has since gone viral on social media.
According to The Star, the police are now investigating the incident.
Kuala Lumpur police chief Mazlan Lazim said three reports have been filed on the matter.
"The case occurred on Sunday along Jalan Burhanuddin Helmi at Taman Tun Dr Ismail.
"Reports were lodged by the person who took the video, the person who put up the flags as well as a representative from Umno Youth," he added.