Anxiety about the building materials appeared to be spreading to other countries, even though the United States and most countries in Europe had restrictions on the kind of cladding used on Grenfell Tower. The German city of Wuppertal on Tuesday evacuated about 80 people from an 11-story apartment tower “for fire safety reasons” after “flammable material was found,” a local official said.

Image Isaac Paulous Credit... Metropolitan Police

Arconic, the American company that sold the combustible material used at the London housing project, said on Monday that it would no longer sell the paneling for use in high rises. On Tuesday, the company’s stock dropped 9 percent on the New York Stock Exchange, and is down 21 percent since the fire.

Whirlpool, which in 2014 acquired the manufacturer of the refrigerator that started the fire, has urged owners of the fridge model to check their units.

The human toll of the fire, which killed at least 79 people, continued to be felt on Tuesday, as the authorities identified a 5-year-old boy, the youngest victim known so far.

The boy, Isaac Paulous, who was identified from his dental records, died from smoke inhalation, the inquest at Westminster Coroner’s Court found. He is among 19 victims to have been formally identified in the fire. The boy choked to death as he and his family tried to escape the flames in their 18th-floor apartment.