Experts at a leading British museum should pull out of a European-funded study into tiny particles because one of their partners is an Israeli company that operates in the West Bank, British scientists and public figures said on Tuesday.

More than a dozen scientists, some from leading British universities, wrote an open letter with film-makers Mike Leigh and Ken Loach calling on the Natural History Museum in London to stop working with the Israeli company Ahava, which makes skincare products from Dead Sea minerals.

Open gallery view An anti-Ahava activist in London's Covent Garden. Credit: Activestills

The group said Ahava works on land in the West Bank, "where it extracts, processes and exports Palestinian resources to generate profits that fund an illegal settlement."

The company denies that claim and says it takes minerals from Israeli waters.

Ahava is based in Israel but has a center in Mitzpe Shalem, a settlement close to the shores of the Dead Sea.

"It is extraordinary, but true, that one of our great national museums is co-ordinating an activity that breaks international law," the group wrote in the letter published in the U.K's Independent newspaper.

"We find it almost inconceivable that a national institution of the status of the Natural History Museum should have put itself in this position. We call on the museum to take immediate steps to terminate its involvement. "

No one at Ahava could immediately be reached for comment. Company executives have previously disputed campaigners' claims about their products, saying they are produced from minerals taken from undisputed Israeli parts of the Dead Sea. The company also says Mitzpe Shalem is not an illegal settlement.

London's Natural History Museum is a lead partner in the four-year study, funded by the European Commission, into nanomaterials, substances at the atomic scale which are used in a range of industries.

The project, called NanoReTox, aims to identify potential risks to the environment and human health posed by the tiny man-made materials.

Ahava and nine other research bodies are also taking part, including the United States Geological Survey, Kings College London and Imperial College London.

Pro-Palestinian campaigners have previously targeted shops around the world that sell Ahava's skin products.

The Natural History Museum's Director of Science Professor Ian Owens said Ahava were experts in the analysis of nano-particles and had been approved as a partner by the European Commission.

"We work within the legal and policy boundaries established by politicians and policymakers, and would not participate in any academic or educational boycotts that could restrict academic freedom," Owens said in a statement.

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