HOUSTON (KTRK) -- A federal air marshal remains in quarantine in Houston after being attacked Sunday night by an unknown assailant at the Lagos, Nigeria airport wielding a syringe.
U.S. law enforcement officials told ABC News they were alarmed by the bizarre, unprovoked attack because the assailant was apparently able to inject an unknown substance into the back of one of the air marshal's arms.
The air marshal was traveling with a team of other marshals when the attack took place in an unsecured area of the airport terminal in Lagos, the officials said.
He was able to board the United Airlines flight to Houston he was scheduled to work and was met early this morning in Houston by FBI agents and health workers from the Centers for Disease Control (CDC).