An agitation by truck drivers against the new law on hit-and-run cases turned violent in Gujarat's Surat city on Tuesday with the protesters attacking a police constable, following which 23 persons were arrested, an official said on Tuesday.

The incident took place near Magdalla Port on Dumas road when a large number of truck drivers blocked the road demanding withdrawal of the new law on hit-and-run cases, Deputy Commissioner of Police (Zone-6) Rajesh Parmar said.