Beauty chain Lush has shut its UK shops, website and factories in protest at the Israeli government "preventing urgent humanitarian assistance from entering Gaza".
In a statement, the firm said more action was also needed by the British government "to bring an immediate stop to the death and destruction, including an end to arms sales from the UK".
It said it had decided to close stores for the day on Wednesday and place posters on windows with the message: "Stop starving Gaza - we are closed in solidarity."
"Across the Lush business, we share the anguish that millions of people feel seeing the images of starving people in Gaza, Palestine," the chain said in a statement.
"Like the rest of the world, we struggle to find ways we can help whilst the Israeli government is preventing urgent humanitarian assistance from entering Gaza.
"One thing Lush can currently send into Gaza is our love and a strong message that we stand in solidarity. This will take the form of halting business-as-usual by shutting our UK shops, website, and factories for one day."
It added that "whilst Lush is losing a day of takings, this also means that the UK government is losing a day of tax contributions from Lush and our customers".
"We hope they too hear the message our closure sends, with more Government action needed to bring an immediate stop to the death and destruction, including an end to arms sales from the UK," the statement added.
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Gaza soap most popular in history
The firm apologised to customers for any inconvenience, but said that its Gaza fundraising soap Watermelon Slice has proved the most successful in its history, "indicating how strongly our customers feel," it said.
So far proceeds have gone towards funding mental health support for children, but there are plans to remarket the product to raise money for medical supplies.
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