The worst heat was felt in southern Europe, while punishing temperatures were forecast to reach 104 degrees Fahrenheit in Paris and remain unusually high in Belgium and the Netherlands.

The heat wave that has blanketed much of Europe is expected to linger over the continent this week, driving up temperatures and offering little reprieve.

Europe’s heat wave is set to peak over the coming days, with a blast of Saharan air triggering red alerts from France to the Swiss Alps.