Sudip Roy Barman, the Congress candidate for the June 23 Tripura by-elections, was injured after a group of men attacked him last night at Ujan Abhoynagar in Agartala, officials have said. He has been admitted to a private hospital for treatment. Party sources say Sudip Roy Barman, who is contesting from Agartala, was in Ujan Abhoynagar to meet a supporter as part of his campaign when he was attacked