No trace of chemicals found in airport
Experts at Miami international airport have found no trace of chemicals in the airport's Concourse B and suspect construction material from airport expansion work had got into the air conditioning system.
Up to eight people were reported to be experiencing breathing problems at the airport in which Concourse B was closed.
There are reports that the number of people affected may be up to 36.
The eight people affected by the incident are being treated for respiratory difficulties.
Concourse B is used by Virgin Atlantic. The airline advised passengers to call their local operator to advise of any likely delays.
