A two-year-old girl has died after a fire at a caravan site in Ingoldmells near Skegness.
Lincolnshire Police were called to Sealands Caravan Park at around 10.30pm on Monday following reports of a blaze.
Police said a woman and three of her children were able to make it out of the caravan safely, but her fourth child died.
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The mum and three children who escaped received medical attention at hospital and were later released.
Police said around 50 people were asked to leave caravans in the immediate vicinity of the fire and were able to go to emergency accommodation created at the Laver Leisure site.
Senior investigating officer Detective Inspector Jo Fortune said: "This is a devastating incident for all involved.
"We are in the very early stages of our investigations and the circumstances which led to the fire are not yet clear.
"We will be working closely with specialist teams to understand what happened."
She added: "We would like to appeal to anyone who was there last night and has not yet spoken to police to come forward, and for anyone with video footage to please share that with officers to add to our intelligence of the incident.
"This is particularly harrowing, with a family losing a child, and we'd ask that people remember those victims and not share footage online."
Police said an investigation team would be at the scene throughout the day, carrying out the initial stages of the inquiry.
They have appealed for any witnesses to come forward.
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