An FIR had been lodged against four persons in connection with the incident, they added.
Munish, a Fiji national and a BA first year student of the university, was allegedly beaten up by his seniors on Saturday, after he refused to follow their orders, the police said.
The seniors even threw tea on Munish's face at the university's 'Maitri' canteen, they added.
On Friday, when Munish was heading to attend lectures, the seniors allegedly stopped him and asked him to address them as "sir" and greet them with "namaste". As the Fijian student refused to oblige, the seniors allegedly misbehaved with him, the police said.
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Munish narrated his ordeal to Professor H B Srivastava, the chairman of the BHU's International Centre, who forwarded his complaint to the chief proctor's office.
Subsequently, the anti-ragging cell of the university launched a probe into the matter.
An FIR had been registered against four persons under IPC sections 323 (voluntarily causing hurt), 504 (intentional insult with intent to provoke breach of peace) and 352 (assault or criminal force otherwise than on grave provocation) at the Lanka police station, Station House Officer Sanjiv Mishra said, adding that the accused would be arrested soon.