OBAURO - Unknown persons opened firing at two Punjab bound buses in Obauro on Monday. According to police, unknown persons opened firing at two buses at it was heading towards Punjab . The assailants stormed the buses and thrashed the bus driver and the passengers after the buses came to a halt. No casualties were reported in the incident. The gunmen managed to flee the scene. The passengers blocked the National Highway as a sign of protest due to which the traffic system was severely affected.