The incident sparked a clash between the two sides at Khirkiya station, 30 km from here, after Mohammed Hussain (43) and his wife Naseem Bano (38) called their relatives for help, according to police.
Two members of Gauraksha Samiti have been arrested on Bano's complaint. Nine acquaintances of Hussain were also arrested and got bail.
The incident took place on January 13 on Kushinagar Express on its way to Gorakhpur. The trouble began after an unclaimed bag was recovered from the general compartment of Kushinagar Express which contained meat.
The couple claimed that the men forcibly searched bags of passengers saying that cow meat was being carted out following which they and some passengers protested.
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"They assaulted me and my husband," Bano alleged, adding that they were rescued by a policeman Sanjay Banka.
When the train was about to stop at Khirkiya station, Hussain rang up his acquaintances who came to the station and a fight broke out between the right wing Hindu activists and them which ended with police intervention, District Additional Superintendent of Police, Kiranlata told PTI.
The police have also launched a manhunt for seven other accused on the complaint of Bano.
Also, nine acquaintances of Hussain were arrested on the complaint of Hemant and released on bail yesterday following a court order, police said.
Government Railway Police (GRP) have registered a case against two unidentified people in connection with the seizure of buffalo meat.