American officials believe Russia was behind the mysterious sonic attacks on diplomats

U.S. intelligence officials reportedly believe Russia was responsible for attacks that have caused American diplomats in Cuba and China to become mysteriously ill over the past two years.

Starting in 2016, Americans at the U.S. Embassy in Havana began to experience hearing loss, impaired vision, dizziness, and symptoms of brain injury that could not be explained. The most recent incident occurred earlier this year, when the U.S. withdrew several diplomats from China after a government worker experienced signs of a brain injury, per The Washington Post. In total, 26 people have been affected.

Now, NBC News is reporting that Russia is the primary suspect of these attacks, based on evidence obtained by the intelligence community throughout a long investigation. But there's not enough proof yet for the U.S. to make this accusation publicly, NBC News reports. Officially, State Department spokeswoman Heather Nauert told The Hill that the U.S. has made "no determination" about who is responsible.

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The U.S. government reportedly believes that some sort of electromagnetic weapon was used, but officials are doing tests on animals with various devices to try to figure out for sure how the attacks were carried out, NBC News reports.

The mysterious attacks had prompted the State Department to permanently reduce much of the Havana embassy's staff earlier this year, as well as cease regular visa services and issue a travel advisory warning Americans to exercise "extreme caution" when traveling to Cuba.