A small update to this. Arrests have been made in the area against separatists who were planning attacks in Venice.

Italian forces arrest Veneto separatists over alleged plot to attack Venice | World news | theguardian.com

Also the validity of the unofficial referendum has been called into question over the last few days, as it seems that people could vote twice and vote from outside the region...

Venice independence movement 'turns to terrorism' - Telegraph

Critics, however, questioned the reliability of the referendum, saying that some votes appeared to have been cast from overseas and that some people may have voted more than once.
There is an investigation into this now, and considering the terror links involved then it is not beyond belief that the vote was rigged.