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Similar letters were sent this week to several other countries.

In response, comic book fans, including Democratic politicians, have pointed out that Superman — an alien born on the planet Krypton, sent to Earth to escape his planet’s destruction — has always been an immigrant.

It sent out increasingly dire alerts warning of dangerous flash flooding and landslides.

Many W&J people were sent more than 1,000km away.

The emails to stockists who were being cut off were sent on 18 June and appear to be identical in content, apart from the name of the shop.