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A US study has found there is “clear evidence” that mobile phones are linked to cancer.

The landmark study, carried out by the National Institute of Heatlh (NIH), claims mobile phone radiation can cause cancers of the heart, brain and adrenal glands.

The NIH has studied the affects of radiation on lab rice, mice and humans since 1999.

The rodents were exposed a level of radiation far greater than humans would be exposed to when using their phones however scientists said the link was "clear".

Scientists warned that men in particular should take precautions about the levels of exposure from phones they receive.

Senior scientist Dr John Bucher at the National Toxicology Program (NTP), in North Carolina, said: "The exposures used in the studies cannot be compared directly to the exposure that humans experience when using a cell phone.

"In our studies, rats and mice received radio frequency radiation (RFR) across their whole bodies.

"By contrast, people are mostly exposed in specific local tissues close to where they hold the phone.

"In addition, the exposure levels and durations in our studies were greater than what people experience."

The study carried out has cost scientists $30 million (£23 million) and was carried out over ten years.

The newly published study specifically looked at radiation from 2G and 3G phones.

The rats tested were exposed to radiation for two years - or most of their natural lifetime.

The RFR exposure was intermittent, 10 minutes on and 10 minutes off, totalling about nine hours each day.