A paramilitary trooper killed a sub-inspector and injured a constable after a heated exchange of words over a cooking dispute in Bihar's Kishanganj district, police said Monday.

Hari Singh, in-charge of Sashastra Seema Bal (SSB) mess, killed sub-inspector Khelan Singh and injured Birbal Ram late Sunday at a SSB camp at Langraduba village.

Birbal was rushed to a hospital in Silliguri in West Bengal. Hari Singh is on the run.