At least one person was killed while four others were injured in a hand-grenade attack here on Friday, police said. According to the details, the incident occurred in Beem Pura here when some unidentified persons hurled hand-grenade. As a result, one person was killed while four others were injured. After the incident, the rescue teams and police reached on the spot while the body and injured were shifted to near-by hospital. Police started investigation of the incident. More than 80 people have been killed in current wave of violence in the city but no stern action was taken so far against the miscreants by the authorities concerned.