London —

London’s Heathrow airport has evacuated the check-in area of one of its terminals due to a possible hazardous substance incident, a Heathrow spokesperson told CNN on Monday evening.

“Terminal 4 check in has been closed and evacuated while emergency services respond to an incident. We are asking passengers not to travel to Terminal 4 and supporting those on site. All other terminals are operating as normal,” a Heathrow spokesperson said in a statement.

Terminal 4 is home to check-in counters for AirFrance, Bulgaria Air, China Southern, Etihad Airways, Korean Air, Qatar Airways, and Vueling and WestJet, among others.

A London Fire Brigade spokesperson said in a statement that firefighters are responding to a “possible hazardous materials incident” at Heathrow.

“Specialist cre

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