Congress activists had gathered at the Laxman Mela ground and taken out a march to gherao the state Assembly.
To check the agitators from proceeding, policemen deployed in large numbers put up barricades and used water cannon to stop them. When they did not, baton-wielding policemen charged at them resulting in a clash as the protesters resorted to stone-pelting.
According to a party statement, several party leaders including AICC general secretary Madhusudan Mistry, UPCC president Nirmal Khatri, former Union minister Pradip Jain Aditya, national general secretary of Youth Congress B V Srinivas, among others, were seriously injured amd admitted to Balrampur and Civil hospitals.
Congress vice president Rahul Gandhi called up Mistry and Khatri and enquired about their well being, it said, adding that he condemned the lathi-charging on party workers at the behest of state government.
Several party leaders including P L Punia, Pramod Tewari, Sriprakash Jaiswal, Moshina Kiswai, Rita Bahuguna Joshi among others took part in the protest.
About 2,500 workers and leaders were arrested and taken to the Police Lines from where they were released later, the party said, while police said that around 1,500 Congress workers have been arrested.
