All flights at Birmingham Airport have been suspended and the runway closed after it was believed a small aircraft crashed near the site.
Two casualties were reported in the incident, West Midlands Police said.
Eyewitnesses described smoke coming from a light aircraft at the end of the runway.
A Birmingham Airport spokesman said: “Following an incident on the airport site all flights are currently suspended and the airport is closed.”
Manchester Airport said it was taking five diverted flights from Birmingham and expected to take more.
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