French firefighters in the Gironde region of southwest France are struggling to contain a massive wildfire that has grown to four times the size of Paris, authorities said Wednesday. The blaze, fueled by a severe heatwave with temperatures forecast to reach 40 degrees Celsius (104 degrees Fahrenheit), remained uncontained as of Wednesday morning. More than 2,200 firefighters and over 20 aircraft have been mobilized, including reinforcements from across France and European partner nations, according to the NDTV report. The SCMP report noted that the fire did not spread overnight, but officials warned that rising heat and afternoon winds could reignite smoldering hotspots, carry embers across firebreaks, and open new fronts beyond firefighting crews' reach. The command center is located in Lège. Authorities are bracing for a challenging day as the combination of high temperatures and strong winds threatens to intensify the blaze. No containment figures have been released, and hundreds of firefighters continue to work on the ground and from the air to protect communities and natural areas. The fire is among several blazes across France this summer, exacerbated by drought and record temperatures.