A working group of 31 scientists from 14 countries meeting at the WHO's International Agency for Research on Cancer IARC.L said a review of all the available scientific evidence suggested cell phone use should be classified as "possibly carcinogenic."
The classification, which puts mobile phone use in the same broad IARC cancer risk category as lead, chloroform and coffee, could spur the United Nations health body to look again at its guidelines on mobile phones, the scientists said.
But more lengthy and detailed research is needed before a more definitive answer on any link can be given.
The WHO had previously said there was no established evidence for a link between cell phone use and cancer.
"After reviewing essentially all the evidence that is relevant ... the working group classified radiofrequency electromagnetic fields as possibly carcinogenic to humans," Jonathan Samet, chair of the IARC group, said in a telebriefing.
The WHO's position has been keenly awaited by mobile phone companies and by campaign groups who have raised concerns about whether cell phones might be harmful to health.
Industry groups immediately sought to play down the decision, stressing the "possibly carcinogenic" category also includes substances such as pickled vegetables and coffee.
"This IARC classification does not mean that cell phones cause cancer," said John Walls, vice president of public affairs for the United States-based wireless association CTIA.
He noted the IARC working group did not conduct any new research, but reviewed published studies, and said other regulatory bodies such as the U.S. Food and Drug Administration have stated that "the weight of scientific evidence has not linked cell phones with any health problems."
John Cooke, executive director of the British-based Mobile Operators Association, said IARC had only found the possibility of a hazard.
"Whether or not this represents a risk requires further scientific investigation," he said in a statement.
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