"We have arrested three persons on Thursday in connection with the killing of Mohammad Shalik (19), who was beaten to death after being spotted with his girlfriend belonging to another community," said Superintendent of Police Chandan Kumar Jha.
The arrests were made on the basis of leads provided by the girl during police interrogation, the officer said.
The family members were opposed to the affair and had warned the youth to stay away from the girl, he said, adding that Shalik did not heed to the warning and came to drop her off near her home on Wednesday night.
When Shalik did not return home late night, the family members enquired about his whereabouts from his friends.
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The family members found Shalik in a serious condition and rushed him to a hospital in Gumla but he succumbed to his injuries on Thursday, Jha said.
Police are trying to find out whether the girl's family members instigated the mob.
All the arrested persons have been sent to jail today, he said.