CHAMAN: A passerby was killed and two security men injured in bomb attacks here on Monday. A bomb was planted under a bridge in Killi Haji Habib in Boghra area when security force vehicles were moving towards the Pak-Afghan border. As a result of explosion one passerby died and two security forces personnel were injured.Meanwhile, Unknown armed man shot at and killed an Afghan national in Shehbaz Town, on Monday. The police sources said that unknown armed man opened indiscriminate fire at a person in Shehbaz Town, leaving him dead. The assailant managed to escape from the scene.