London City Airport evacuated amid fire alarm

A policeman stands outside London City Airport which has been closed as dozens of passengers have been treated for breathing difficulties after what the emergency services called a reported "chemical incident.", Friday, Oct. 21, 2016. The airport said passengers were told to leave the terminal Friday afternoon because a fire alarm was sounding. Departing flights were suspended, and several incoming flights diverted to other airports. (Victoria Jones/PA via AP) (The Associated Press)

Emergency services outside London City Airport after people were evacuated after what the emergency services called a reported "chemical incident.", Friday, Oct. 21, 2016. London Fire Brigade says City Airport has been declared safe, three hours after it was evacuated by a suspected chemical incident. (Victoria Jones/PA via AP) (The Associated Press)

A view of London City Airport, after people were evacuated after what the emergency services called a reported "chemical incident.", Friday, Oct. 21, 2016. London Fire Brigade says City Airport has been declared safe, three hours after it was evacuated by a suspected chemical incident. (Victoria Jones/PA via AP) (The Associated Press)

Officials say London City Airport has been evacuated after a fire alarm sounded and some passengers reported feeling unwell.

The airport said passengers were told to leave the terminal Friday afternoon because a fire alarm was sounding. Several incoming flights from destinations such as Frankfurt, Amsterdam, Belfast and Paris were diverted to other airports.

The Metropolitan Police force says officers were called to the airport just after 4 p.m. (1500GMT), "following reports of passengers being taken unwell."

Police, the ambulance service and the London Fire Brigade are all at the airport investigating.

City Airport, located in east London's docklands, is the smallest of the British capital's international airports.