Devon Newell will appear via video link at Camberwell Green Magistrates Court on Tuesday.
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Skies clear across many areas overnight but heavy rain moves in across Ireland.
The bomb exploded after a group of children picked it up thinking it was a toy, a relative of one of the victims said.
Cladding from high-rise flats in 25 local authority areas has now proved to be potentially flammable in the urgent safety review.