Armed officers were pictured at the scene of a shooting in New Brunswick, Canada, hwere three officer from the Royal Canadian Mounted Police were shot dead and two others were injured.
The force tweeted: "If you live in the marked area stay inside/lock doors. Roads blocked. Traffic disrupted. Avoid area."
Police are hunting 24-year-old Justin Baroque and say that the gunman is believed to be at large in the Pinehurst area of the city.
More top news
We round up the best reaction on social media to the news that Rio Ferdinand is hanging up his boots
Coronation Street stars paid tribute to "caring, loveable and funny" Anne Kirkbride, who played Deirdre Barlow for more than 40 years.
Queens Parks Rangers defender Rio Ferdinand has announced his retirement from football after his wife's recent death.