premise: The BBC's correspondent Alan Johnston based in Gaza has been freed after almost four months in captivity. The BBC broadcast images of Alan Johnston leaving a building in Gaza and entering a white car. Hamas police surrounded a building where it was believed Johnston was being held. Earlier, Hamas had captured several members of the Army of Islam and continued to put pressure, by threat of force, on the captors. An intervention by another militant group, the Popular Resistance Committees, led to a breakthrough in negotiations between Hamas and the Army of Islam.
hypothesis: Alan Johnston is now free.