<p>Police are trying to establish if anyone is missing following an explosion at a house in Kent. </p><p>Several people were believed to have been trapped and had to be freed by emergency services. </p><p>Ambulance staff are assessing patients at the scene in Willesborough, Ashford. </p><p>Firefighters have been tackling a blaze at a house and are now working to extinguish the last remaining signs of fire. </p><p>Members of the public have been urged to avoid the area and residents have been asked to keep their windows closed.</p>