Sangrur, April 26 -- A protest over the "undemocratic" appointment of a truck union president turned violent on Saturday when protesters clashed with police, hurling stones and damaging several official vehicles during a highway blockade in Bhawanigarh, Sangrur.

The confrontation broke out at the Bhawanigarh bus stand on the Bathinda-Chandigarh national highway, where supporters of Lovely Kakra, a long-time AAP worker and a candidate for the president's post, had gathered to oppose the election of his rival Malwinder Singh.

Bhawanigarh deputy superintendent of police (DSP) Rahul Kaushal confirmed that three cops sustained injuries due to the scuffle and were receiving treatment at the Bhawanigarh civil hospital.

"The protesters eventua...