The youth in question was arrested on charges of "obscenity" in public place and released later on bail, according to police officials.
The incident, in which BJP's Aligarh city convenor Sangeeta Varshney is seen slapping the girl twice, took place on Tuesday when she allegedly saw her having tea with the youth, according to the police.
In the video which has gone viral on social media, Varshney is heard saying, "Tere ko samajh mein nahi aataa kaun Hindu hai, kaun Musalmaan hai. Pyaar se samajhaa rahee hoon, samajh hee mein nahi aa raha. (Don't you understand who is a Hindu and who is a Muslim. I am politely making this clear, but even then it seems that you are not getting it)."
Senior Superintendent of Police Rajesh Pandey said that after the slapping incident, a case under relevant sections of the IPC pertaining to obscenity at a public place was registered against the youth.
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He was arrested but later released on bail, Pandey told PTI today.
The SSP also said that the girl's father arrived on the spot and took his daughter away after declaring that he and his family did not wish to make an issue of the incident.