Washington (CNN)—Federal agencies are investigating at least two possible
incidents on US soil, including one near the White House in November of last
year, that appear similar to mysterious, invisible attacks that have led to
debilitating symptoms for dozens of US personnel abroad.

Multiple sources familiar with the matter tell CNN that while the Pentagon
and other agencies probing the matter have reached no clear conclusions on
what happened, the fact that such an attack might have taken place so close
to the White House is particularly alarming.

Defense officials briefed lawmakers on the Senate and House Armed Services
Committees on the matter earlier this month, including on the incident near
the White House. That incident, which occurred near the Ellipse, the large
oval lawn on the south side of the White House, sickened one National
Security Council official, according to multiple current and former US
officials and sources familiar with the matter.


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