London transport staff warned of anti-mask posters with razor blades

London transport staff have been warned after anti-mask posters with razor blades on the back were found, a union has said.

The Rail, Maritime and Transport (RMT) union said it had raised the issue of “Masks Don’t Work” posters with Transport for London (TfL).

TfL said it was not aware of any incidents involving blades but had given advice to its workers.

A similar poster was found in Cardiff where a woman was injured removing it.

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