what's the Force Majeure Case?

Force Majeure is the circumstance which the party would be release from his obligation if it is in FM.In such a condition the party that is in FM has not to pay any penalty to other party due to breaching contact terms because he had not control to prevent it.
Question:Suppose that two party have a fob contract and the buyer is shipping the given cargo to his terminal in definite destination.In the half way a terrorist explosion happen in the terminal and the buyer announce the FM.so Who should got the liability? Of course the buyer why? Because the contract is fob base and total risk and liability had transfered to buyer in loading terminal.