The PM is set to brief fellow leaders on her Brexit plan amid disagreement over the Irish border.
A woman and man have died, travel is disrupted and power lines are cut as Storm Ali hits the British Isles.
Police sources say a hoax is also likely to be one line of inquiry after an incident at a Wiltshire restaurant.
The inquest into the deaths of five people is also shown CCTV footage of Khalid Masood's final movements.
Orla Kiely's shops and website have closed amid reports that its parent company ran out of cash.