People cool off in the Brussels Park in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

People get water at a water point near the Grand Place in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

An icecream is pictured under bright sunshine at the Grand Place in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

People cool off in a fountain in downtown Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

People visit the Grand Place in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

People cool off in the Brussels Park in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

People cool off in the Brussels Park in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

A vendor sells icecream in the Brussels Park in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)

A man and his dog are seen at a pond in Brussels, Belgium, July 24, 2019. Belgium has been placed on red alert for the first time in recorded history following a heatwave that has swept the land, said David Dehenauw of the Royal Meteorological Institute (known as the "IRM"), on Twitter on Tuesday. (Xinhua/Zheng Huansong)