The strong suspicion that Russia was behind the alleged attacks is backed by signals intelligence, meaning intercepted communications, say U.S. officials.
WASHINGTON — Intelligence agencies investigating mysterious “attacks” that led to brain injuries in U.S. personnel in Cuba and China consider Russia to be the main suspect, three U.S. officials and two others briefed on the investigation tell NBC News.
The suspicion that Russia is likely behind the alleged attacks is backed up by evidence from communications intercepts, known in the spy world as signals intelligence, amassed during a lengthy and ongoing investigation involving the FBI, the CIA and other U.S. agencies. The officials declined to elaborate on the nature of the intelligence.
The evidence is not yet conclusive enough, however, for the U.S. to formally assign blame to Moscow for incidents that started in late 2016 and have continued in 2018, causing a major rupture in U.S.-Cuba relations.
Since last year, the U.S. military has been working to reverse-engineer the weapon or weapons used to harm the diplomats, according to Trump administration officials, congressional aides and others briefed on the investigation, including by testing various devices on animals. As part of that effort, the U.S. has turned to the Air Force and its directed energy research program at Kirtland Air Force Base in New Mexico, where the military has giant lasers and advanced laboratories to test high-power electromagnetic weapons, including microwaves.
Although the U.S. believes sophisticated microwaves or another type of electromagnetic weapon were likely used on the U.S. government workers, they are also exploring the possibility that one or more additional technologies were also used, possibly in conjunction with microwaves, officials and others involved in the government’s investigation say.
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The US military has been working to reverse-engineer the device or weapon used to harm US diplomats in #Cuba, @ckubeNBC and I report: https://t.co/JI8kEtKHwN
— Josh Lederman (@JoshNBCNews) September 11, 2018
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