Police have arrested nine terrorists involved in last year's suicide attack on a Pakistan Air Force bus in Sargodha, Capital City Police Officer Pervaiz Rathore told a press conference on Friday. He said the terrorists were planning to attack the Sargodha prison and free an accomplice Ummar Farooq, who was in jail for alleged involvement in the bus bombing. Rathore said four suicide vests, two hand grenades, two grenade launchers, two AK-47 rifles and a haul of explosives had been seized from the terrorists who had links in Wana. "They also have links with banned militant organisations," the police officer said. He said the arrested persons had targeted a Sargodha police inspector who played a vital role in tracing them.