SOUTHBORO (CBS) — A boarding school in central Massachusetts is being sued by parents who claim the school’s Wi-Fi signal is making their son sick.

The Worcester Telegram & Gazette reports that the unidentified plaintiffs have filed a lawsuit against the Fay School in Southboro. The parents say their 12-year-old son has “Electromagnetic Hypersensitivity Syndrome” and has suffered headaches, nosebleeds and nausea since the school activated a stronger wireless signal in 2013.

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The family is seeking $250,000 in damages and wants the school to switch to Ethernet cable Internet or turn down the Wi-Fi signal, according to The Telegram.

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The school said in a statement that a company analyzed the Wi-Fi and found the signal is well within federal safety limits.

“Isotrope’s assessment was completed in January 2015 and found that the combined levels of access point emissions, broadcast radio and television signals, and other RFE emissions on campus ‘were substantially less than one ten-thousandth (1/10,000th) of the applicable safety limits (federal and state).” the school said.

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WBZ-TV’s Dr. Mallika Marshall reported in June that a number of people believe invisible rays are making them sick, but some doctors say there is no evidence of a link between Wi-Fi and illness.