US investigates more 'Havana syndrome' attacks: senators

Hit by mysterious microwaves? The US embassy in Havana

US senators said Friday that the government is investigating an apparent increase in mysterious directed-energy attacks dubbed "Havana syndrome", amid new reports of potentially brain-damaging incidents inside the country.

Democratic Senator Mark Warner and Republican Marco Rubio, who lead the Senate Intelligence Committee, issued a statement after two media reports saying attacks had taken place in Washington, including just outside the White House, and in Miami, Florida.

"This pattern of attacking our fellow citizens serving our government appears to be increasing."

Moscow is suspected to be behind them, even if the mechanism for them has yet to be explained. Scientists have theorized that the attacks arise from pulsed microwaves.

A year earlier, according to reports, another White House official reported feeling some symptoms while walking her dog in the Washington suburb of Arlington.

Those affected experience similar symptoms reported in the original case affecting US diplomats in Havana in 2016.

CNN said some members of Congress had been informed of the more recent incidents in closed-door intelligence briefings.

Haines told the Senate Armed Services Committee she could not discuss the issue openly because it involved classified information.

"Ultimately we will identify those responsible for these attacks on American personnel and will hold them accountable," they said.

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