Halton Region Police are investigating.
C'mon you people! Is it worth somebody's life?
Animal activists have often protested at the Appleby Line entrance to the plant owned by Sofina Foods.
The province last week passed new legislation that includes no-trespassing zones at the entrance to meat-packing plants and stiffer fines for violations of the bans.
Farm properties have also gained greater protection from protestors and activists trying to capture videos of livestock and poultry in barns.
The legislation has been welcomed by farm organizations, but criticized by animal activist organizations who say they will try to defeat it with court challenges.
