Three people have been killed in a shooting near a swimming pool in Spalding, police have said.
Police were called to Castle Swimming Pool on Pinchbeck Road around 9am, a spokesman for Lincolnshire Police said.
The suspected gunman is thought to be among the dead.
The police spokesman said: “There is an ongoing police investigation and at this stage we are not looking for anyone else in connection with the incident.
“There is no indication that this is a terrorist related incident and no shots have been fired by police.
"We would urge members of the public to stay away from the area at the present time."
East Midlands Ambulance Service said paramedics were told to approach the scene with caution and fought to save the three people who died.
A spokeswoman said: "We received a call at 9.04am reporting gunshots on Pinchbeck Lane, Spalding. Our ambulance crews and paramedic officer were sent to the emergency and told to approach with caution.
"Upon arriving at scene, our paramedics treated three patients who had gunshot wounds. Despite the best efforts of everyone at the scene the patients were pronounced dead.
"This is a tragic incident and our thoughts are with the friends and families of those involved."
Earlier, an air ambulance landed at the scene. Ambulances and six police cars are also present.
Spalding Grammar School told the Lincolnshire Echo they were in lockdown earlier and no one was allowed out of the building.
Labour leader Jeremy Corbyn tweeted to say his thoughts were with the victims and their families.
A resident of nearby Pinchbeck Road, who did not want to be named, told the Press Association she was "terrified" when she heard the news.
"All we know is as much as was on Twitter. We've not had the police round here to say keep your doors shut," she added.
"We've not had anyone say there's a danger here.
"We are hoping that, although you never want this sort of thing to happen, but we're hoping it was a self-contained incident because we haven't had any people round here saying there's any danger."
Witnesses have been asked to contact police.
This article will be updated shortly
