The FBI and CDC launched an investigation after someone attacked a federal air marshal with a syringe inside the Lagos, Nigeria airport on Sunday, Fox News reports .
The air marshal, who was on the public side of the airport, was injected with an unknown substance.
He and his team were whisked back to the U.S. with the syringe.
“The [air marshal] reported that the subject stuck him with a syringe and it is believed he was injected with an unknown substance,” according to an alert from the TSA. “After consultation with the consulate and physicians, the [federal air marshal] was given precautionary medication.”
An FBI spokesman added: “Out of an abundance of caution, the Centers for Disease Control and Prevention conducted an on-scene screening of the victim when United Flight 143 landed in Houston early Monday morning. The victim did not exhibit any signs of illness during the flight and was transported to a hospital upon landing for further testing. None of the testing conducted has indicated a danger to other passengers.”