By Erica Wenig

Solid evidence has emerged Israel spied on U.S. nuclear negotiations with Iran by using a powerful virus to infiltrate computers in hotels where talks were held.

Kaspersky, a Moscow-based cybersecurity firm, discovered it had been infected by a sophisticated virus last year, reports The Wall Street Journal. The firm realized it was dealing with an advanced version of Duqu, a virus U.S. officials say Israel uses to collect especially sensitive information.

After a investigation of computers worldwide, a Kaspersky team found the virus in three luxury European hotels. They had one thing in common: hosting discussions between the U.S. and Western powers over Iran’s nuclear capabilities, a deal Israeli Prime Minister Benjamin Netanyahu firmly opposes.

U.S. officials accused Israel of spying on negotiations and sharing the information with members of Congress to sabotage the potential nuclear agreement earlier this year.

Israeli officials deny spying on America or other allies, reports the WSJ. The Israeli embassy said they had no addition comment in an email to The Daily Caller News Foundation.

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