LONDON, Ont. - The city of London, Ontario, is doing all it can this weekend to avoid a repeat of a drunken Saint Patrick's Day riot that left a residential neighbourhood looking like a war zone.
   A mob hurled rocks and bottles at officials and fuelled a massive street fire with furniture, fences and alcohol last year.
   Sixty-eight people were arrested and more 170 charges were laid.
   This year, the city is determined things will be different.
   Police Chief Brad Duncan says there will be zero tolerance for any parties that get out of hand.
   He says more officers will be on the streets today and tomorrow than on any other day in recent city history.
   Police are also monitoring social media for tips on planned gatherings and have already reached out to a few individuals to let them know over-the-top events won't be allowed.
   Authorities will be paying special attention to the area around the University of Western Ontario and the Fleming Drive student enclave around Fanshawe College -- the site of last year's riot.
   The Fanshawe Student Union has asked students to celebrate sensibly to avoid further tarnishing the school's reputation, which took a beating last year.