US judge allows lawsuit against Grenfell Tower cladding firm

American shareholders get go-ahead after witnesses allege Arconic managers knew cladding was unsafe

US shareholders in the Grenfell Tower cladding firm Arconic can proceed with a lawsuit against the company, a court has ruled, after witnesses said managers knew the cladding performed badly in fire safety tests but was being used on high-rise buildings anyway.

A group of US investors say they incurred financial losses when Arconic's Reynobond PE cladding was implicated in the Grenfell fire in 2017, which left 72 people dead.