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During the initial suspension of the exemption the US Postal Service temporarily stopped accepting parcels from mainland China and Hong Kong.

Triggered by a proposed government treaty that would have allowed extradition to mainland China, the protests quickly grew to reflect wider demands for democratic reform.

It has been suggested the noise of ferries operating between Lewis and the mainland could be carried on a persistent easterly wind.

One theory is that they arrived with a cargo from the mainland such as hay, but they may have been released intentionally to control rabbit populations.

The industrial action comes after a series of protests last year in the Canary Islands and Spanish mainland over mass tourism.