Some 15 protesters demanding Tharuhat province sustained injuries during a clash with police personnel on Sunday afternoon. The clash was ensued as police used force after protesters hurled stones at the former during a corner assembly near District Administration Office. The law enforcement agency lobbed over a dozen shells of teargas and baton charged demonstrators. Three police also got injured during the clash. The injured are undergoing treatment at District Hospital, said SP Govinda Ram Pariyar.