WARSAW, Poland—A powerful autumn storm blasted across parts of Europe on Thursday, killing four people in Poland and causing damage and disruption across a large swath of the continent. According to reports in Polish media, the hardest-hit area was around the western city of Wroclaw, where powerful gusts topped a delivery truck, killing its driver. Elsewhere, the storm knocked down a wall of a building being renovated, crushing a worker to death, and a tree was blown onto a car carrying two people, killing them both. TVN24 reported that a concrete wall collapsed in the capital, Warsaw, injuring a woman who was hospitalized. The storm swept ashore in the Brittany region of France’s Atlantic coast on Wednesday, where it toppled trees, damaged buildings and knocked out power to a quarter of a million homes by Thursday morning. Train services were disrupted by uprooted trees littering tracks in France, Germany and …