LONDON - Britain's roads and railways were hit by closures on Monday after Storm Bert battered the country over the weekend, causing widespread flooding and killing four people.

There were more than 300 flood warnings and flood alerts in place across England and Wales as of 1100 GMT on Monday, while trains from London to the southwest were canceled and rail services in central England were severely disrupted.

The environment agency estimates around 100 properties have been flooded.

READ MORE: Storm Bert sweeps through UK, leaving 3 dead, hundreds of home flooded

Among those killed during the storm were a dog walker in north Wales and a man who died when a tree hit his car in southern England.

Even though the storm was subsiding, the government said people should remain vigilant as the forecast showed flood risks for England would continue for the remaining of Monday, with ongoing river flooding expected.

ALSO READ: Deadly storm pounds Northwest US, leaving half a million without power

Some major roads were closed, while fallen trees on rail lines cut off services between London and Stansted Airport, Britain's fourth busiest hub. Lines have now reopened following earlier damage but major disruption is still expected.

The disruption comes after Storm Bert hit Britain late on Friday, bringing snow, rain and strong winds.

The Met Office kept a warning for strong winds in place for northern Scotland on Monday and said the storm would clear from that part of the country early on Tuesday.