Disgraceful, if accurate. IHE reports that the University is denying they are cancelling the conference. My guess is that the University is overstating the safety/security issues (and understating its ability to address them) in order to make it appear that the organizers pulled the plug.
The larger issue, of course, is why some supporters of Israel feel the need to shut down critical speech.
(Thanks to Taylor Carman for the pointer to the first item.)
UPDATE: Chris Bertram (Bristol) calls my attention to this pertinent piece.