It's now clear that this was a planned action and there was no danger.
But when it happened, this wasn't obvious in any way. I assume the
other staff members knew about it, was it discussed at the last meeting?
I really like April Fools, but this was no April Fool. Faking a crime,
in this case claiming to have been hacked, is no prank or joke. It
doesn't matter that it was April 1. either. This was absolutely
unacceptable, never do this again!