Italy limited work outdoors, France shut schools and Turkey battled wildfires on Tuesday in a European heatwave that meteorologists said was "exceptional" for striking so early this year.

More than a thousand schools were closed in France on Tuesday and the top floor of the Eiffel Tower was shut to tourists as a severe heatwave continued to grip Europe, triggering health alerts across the region.

While conditions are beginning to improve in some regions, France remains particularly affected, bracing for extreme heat. The French capital, Paris, is forecast to reach a blistering 40 degrees Celsius (104 degrees Fahrenheit) on Tuesday.

The conviction of Boualem Sansal, an outspoken French and Algerian writer, has worsened tensions between the countries.

Franco-Algerian author Boualem Sansal is facing five years in prison in Algeria after he lost an appeal against his conviction for “undermining national unity.”