(CNN)EgyptAir Flight 804 vanished from radar on its way from Paris to Cairo with 66 people aboard, the airline said Thursday.

The plane was flying at 37,000 feet when it lost contact overnight above the Mediterranean Sea, the airline tweeted.
Somber relatives gathered in Cairo and Paris airports, seeking word on their loved ones.
They were ferried to special centers at both airports, where translators and psychiatric support awaited.