JABALPUR: Five Congressmen were injured on Monday when son of BJP MLA Pratibha Singh opened fire at his rivals while campaigning at Mankhedi village under the Jabalpur Lok Sabha seat following a dispute, police said."Golu Singh, who has a past criminal record, fired at his rivals following a dispute in which five Congressmen identified as Durjan Patel, Abhay Pratap, Nilesh Singh, Rakesh Patel and Roopsingh Patel suffered injuries," Deputy Inspector General (DIG) Makrand Deoskar told reporters.Among the injured, four were admitted to government medical college here for treatment, where their condition is said to be stable, he said.Congress candidate and noted lawyer from Jabalpur Lok Sabha seat Vivek Tankha reached the hospital where a large number of Congressmen gathered and held protest demanding action against the accused.So far, Singh has not been arrested, the police said.