According to many news source, a fire alert happened last Friday on Kennedy Space Center property. The Launch Control Center and possibly also the VAB had been evacuated. NASA sources tell that the alert was not a drill, but it was a false alert. So, it was real, but the fire sensor didn’t work correctly and detected fire where none was.
To the best of my knowledge, work at the launch pad was not (seriously) affected by the fire alert. However, all traffic, including tour buses, was stopped.
But now think about launch day: if such an alert happens then, the launch will be scrubbed for sure. I hope this will not happen while I am on my launch viewing trip.