GILGIT: Two passengers were killed and four others injured in a hand grenade attack on a passenger bus near Meenawar on Sunday. According to police sources, unidentified armed men attacked the bus with a grenade, which killed two and injured four others. Police and local relief teams reached the site of the incident and shifted the dead and injured to the district headquarters hospital. Hospital sources said the injured were in critical condition and the death toll might rise. An emergency was declared in Gilgit Hospital and doctors and nurses were called in to deal with the situation. Police said after the attack, they launched an operation to track and arrest the culprits.