1. You assume that the roads toward this particular Elysium aren't blocked or protected by "spike strips" that can make a gas truck pretty useless, barricades that can stop a vehicle if necessary, or a sniper that can shoot either the driver of the gas truck or the engine of the gas truck, etc. (Also, there's the fact that gasoline isn't as combustible as it seems to be in movies. The gas truck wouldn't necessarily explode just because it crashed into the building.) With the resources of a Prince, mobilizing the city's police force to do a little protection for diplomats having a private meeting in a public building is not difficult, especially if the officers in question are potentially ghouls and on the Ventrue payroll.<br/><br/>2. They wouldn't necessarily attempt to silence it. They'd just put a spin on it that made sure no Masquerade breach was reaching the media, and they would probably wind up spinning it in such a way that it furthered other goals that they had for the complacency of the kine. (Let's be honest, in American news reporting, facts often take a backseat to furthering an agenda, and in the WoD, it's somehow worse.) And that's assuming the problem wasn't handled nearly instantly. In walk three armed goons, out come the Sheriff's claws, the Gangrel and Brujah bikers' various fighting styles, etc. and three armed goons are quickly turned into assorted chunks of three formerly-armed goons, good thing one guy knows a carpet cleaner who can be Dominated to forget this. Nothing left but an unsubstantiated report of gunfire from the general area and no evidence of a shooting, police are baffled (and since the news won't cover it again, jumping to the next scandal or soundbite or political faux pas, very few people remember hearing about it a week later).