Police said, as a precaution, officers have evacuated the Rochford Hundred Golf Club and Westcliff Rugby Club due to its proximity to the incident.
An eyewitnesses from Westcliff Rugby Club said a presentation event was happening at the time of the incident.
Matt Dent, Southend City Council's cabinet member for business, culture, music and tourism, said on X: "I am aware of the live serious incident ongoing at London Southend Airport.
"At present all I know is that a small plane has crashed at the airport. My thoughts are with all those involved, and with the emergency services currently responding to the incident."
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