Four BJP workers sustained injuries in a clash with Congress men outside the district police chief's residence on Sunday night, police said.
The incident occurred when unidentified persons smashed the windscreen of the vehicle of BJP candidate from Rohtak Parliamentary constituency Capt Abhimanyu, they said.
Abhimanyu alleged that as he got down from his vehicle some Congress supporters travelling in another vehicle tried to run him down but he was saved, they added.
Abhimanyu's younger brother and Union Minister Sahib Singh Verma's son-in-law Dev Suman was also accompanying him at the time of the incident.
One of the injured has been admitted to PGIMS hospital here, they said, adding police have registered an FIR in the case.
Leader of Opposition in Haryana Assembly Bhupinder Singh Hooda is contesting the Lok Sabha polls from here as a Congress nominee.