Four dead in Hydro One helicopter crash in Tweed, Ont.

Friday, December 15, 2017, 5:06 PM - Four people are dead after a Hydro One helicopter crashed in Tweed, Ontario Thursday afternoon.

At a news conference Friday, the Transportation Safety Board said the helicopter was attempting to land when it crashed. Weather was not a factor.

Hydro One releases statement

"We are deeply saddened to confirm that an incident involving one of our helicopter aircraft occurred in the Tweed area and has resulted in four fatalities. Emergency services are on-site and we have notified all the appropriate oversight organizations," Hydro One said in a statement.

"Our thoughts and prayers are with their families at this difficult time. During this grieving process, we will do everything we can to assist our employees and their families who have been affected in any way, by providing counselling and support.

"The safety of our employees is paramount and Hydro One together with appropriate safety agencies that have been dispatched will investigate the incident."

The Transportation Safety Board of Canada is investigating.

Tweed is located 2 hours east of Toronto.

There are many risks associated with flying. Weather Network science writer Scott Sutherland discusses some of them, with a focus on turbulence, in the science behind the weather.