Two customs workers at John F. Kennedy International Airport who thought they had inhaled lethal nerve gas in reality fell ill to every day nail polish remover.
The FBI said two employees reported feeling sick after opening a package that turned out to just contain beauty supplies.
FBI spokesman J. Peter Donald said Sunday the package was tested and the employees were screened out of "an abundance of caution." He said agents have cleared the scene.
According to the New York Post, it remains uncertain as to why several tests initially produced results indicating the presence of the highly lethal nerve agent VX, which can kill someone through mere inhalation or contact with the skin.
The incident occurred at a giant mail processing facility for overseas bound mail about a quarter of a mile from the airport. According to a source, the package, which is believed to have been from China, was broken while in transit.
While the building and a US Customs facility were evacuated and quarantined, the JFK airport was able to operate as normal.
The Port Authority of New York and New Jersey, which oversees the airport, hasn't responded to a call seeking comment.
Customs and Border Patrol referred questions to the FBI.
Based on reporting by The Associated Press.