LAHORE - On receiving an anonymous call about the presence of a bomb at PIA flight PK-307, the authorities at Lahore airport offloaded the passengers to search the plane. The Karachi-bound plane was about to take off at 10 pm when PIA call center in Karachi received the call at 9:50 pm. Around 158 passengers were on board. The search for bomb was in progress till the filing of this report.