Five teenage boys have been seriously hurt after being stabbed at a Halloween party in Hampshire, leading police to launch a search for an “unknown group”.The boys, all aged 16 and 17, were found injured after police were called to a property in Chandler’s Ford near Eastleigh just after 10.30pm on Saturday.All were taken to hospital with serious injuries, Hampshire and Isle of Wight police said.Officers at the scene established an “unknown group” had gained entry to a party at a property in Park Road.An investigation was launched and scene-of-crime restrictions remain in place in Park Road and Valley Road.Senior investigating officer DCI Elizabeth Pirie said: “We are already hard at work identifying anyone who was at the party who may be able to assist our inquiries, whether that be having directly witnessed what took place, having filmed any footage which may be relevant, or who may be able to help us identify the unknown group.“I understand the response the local community may have to hearing about this incident this morning, and I do not underestimate the impact our scenes will be having on those living in the area.“These scenes are vitally important for our inquiries and we are grateful to the understanding of our communities whilst we work to establish the facts.“If you do have any concerns or information, then please do not hesitate to speak to us.”The force said they were interested in speaking to anyone who attended the party or has video footage, including doorbell camera recordings covering Park Road and the surrounding area.Liz Jarvis, the MP for Eastleigh, wrote on X on Sunday: “My thoughts are with the victims and their families and all those affected by the incident in Chandler’s Ford last night, and my thanks go to our local police and emergency services for their prompt response.“It’s important not to speculate or share unverified information.”Anyone with information should contact police on 101 or via the force’s website, quoting reference 44260534624, or contact Crimestoppers on 0800 555 111 or via the independent charity’s website.