A scorching heatwave is fuelling dozens of wildfires across parts of southern Europe, forcing thousands of people from their homes and pushing temperatures above 40C (104F). Red heat alerts have been issued in parts of Italy, France, Spain, Portugal and the Balkans, warning of significant risks to health.

ATHENS, Greece — Wildfires intensified across southern Europe on Wednesday with a round-the-clock battle to protect the perimeter of Greece’s third-largest city and at least three deaths reported in Spain, Turkey and Albania.

Outside the Greek port city of Patras, firefighters struggled to protect homes and agricultural facilities as flames tore through pine forests and olive groves.