Symptoms of the ailment have included migraines, nausea, memory lapses, and dizziness.
Russian investigators claim gunmen behind concert hall attack had ties to Ukrainian nationalists. US dismisses allegations, blaming Islamic State.
The event came within a half hour of reports that the United States and Britain had begun striking Houthi targets in Yemen, and if it was indeed an attack, it was presumably an act of retaliation.
Dozens of military bases housing US forces have been attacked, increasing fears of a broadening regional conflict.
Demonstrators, who blame Israel for Tuesday's blast at the Gaza hospital although Israeli officials say it was a misfired rocket from a Palestinian group, were prevented from reaching the embassy.
The US embassy said it is back to normal operations on Wednesday afternoon.
An embassy spokesperson said that "The Department of State has no higher priority than the safety and security of US citizens overseas, including US government personnel serving abroad."
The embassy reopened in 2015 when Cuba and the US restored diplomatic ties.
Movers and shakers in Israeli society.
"Please know that we at the US embassy are not intimidated by this incident, and our security protocols are very strong and our partnerships are ironclad," US Ambassador Dorothy Shea said.
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