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Iranian hacker activity against energy companies spiked during the last two years raising concerns over the safety of digital and physical infrastructure, a new report by cyber security firm Cylance said.

Houston-based Calphine, Saudi Arabia’s Saudi Aramco, Qatar-based Ras Gas and Mexico’s Pemex are among the energy firms that have been targeted by an Iranian hacker campaign.

The report details breaches at more than 50 energy, infrastructure and transportation companies and concludes that all the attacks were committed by the same Tehran-based group, called Operation Cleaver.

Cylance said the report included only a fraction of Operation Cleaver’s activities.

The hacker group was also responsible for a cyber attack against the U.S. Navy in 2013.

“We believe that if the operation is left to continue unabated, it is only a matter of time before the team impacts the world’s physical safety,” Cylance said.

Pemex said it did not detect any attacks from Iran based hackers but it is constantly monitoring its networks.

An Iranian diplomatic told Reuters that the report is a “baseless and unfounded allegation fabricated to tarnish the Iranian government image.”

California-based Cylance said it alerted some of the companies it studied of the breaches and reported the information to the FBI.

The FBI declined to comment on the report.