In a Facebook post, Aman Sinha, 22, a Master's student at JNU, said a CISF official asked him to take off his earphones, which he did not do. An argument followed.
"Then another CISF person came and said you are spoiling the name of the nation, 'Pakistan bhejenge tum mussalay ko aaj.' (You Muslim, we will banish you to Pakistan today). They dragged me to the security office through the very long passage where there was no CCTV and no public," Mr Sinha said on his Facebook post.
"They started abusing my mother and sister, thrashing and beating me very badly... I tried to record it which they later made me delete and threw away my phone," he alleged.
"He started yelling and arguing with constables Shoeb and PC Bisht who were on duty after he was asked to remove the earphones, which is a normal security drill in Delhi Metro. He was unwilling and used abusive language after which he was taken to the metro control room," a senior CISF officer said.
The officer said Mr Sinha was taken to the control room where he apologised in writing. The matter lasted about 30 minutes as seen on CCTV cameras, the officer said, adding a probe has been ordered into the matter.