Storm Arwen delivered powerful winds with gusts of up to 100 miles per hour throughout several regions of the United Kingdom, killing at least two people and leaving tens of thousands without electricity (160 kph).

On Friday evening, a man was killed after his car was hit by a falling tree in Northern Ireland’s County Antrim, police said in a statement. According to local media, the guy was the principal of an elementary school.

According to authorities, another man was murdered in Cumbria, in the northwest of England, when he was struck by a falling tree.

Gusts of 98 mph hit Brizlee Wood in Northumberland, northeastern England, according to the Met Office, which said yellow warnings remained in place on Saturday across much of the country.

“Many roads remain closed so please only travel if absolutely necessary,” it said on Twitter.

More than 100,000 customers were without power, Northern Powergrid, which delivers electricity to properties in the North East of England and Yorkshire, said on Saturday morning.

Engineers were also working to restore supplies in Scotland and southern England.

P&O Ferries said it had been forced to halt sailing between Northern Ireland and Scotland.