Currently sat on UA225 IAD-SFO which halfway through the safety demonstration was forced to return to the gate after a pax stood up visibly agitated claiming the plane had been hacked and demanded to be let off. Now sitting at gate with 2 ambulances on the scene and other pax considering deplaning out of fear for why this one left. FAs trying to provide reassurances. All very strange.
.bomb has attributed the delay to "operational difficulties". Now expected to get to SFO for 2am.