A fourth boy has been arrested after five teenagers were stabbed at a Halloween party in Hampshire.

Police were called shortly after 22:30 GMT on Saturday to Park Road in Chandler’s Ford where an “unknown group” had gained entry to the event over a garden fence.

One boy, 17, remains in hospital in a life-threatening condition. The other four boys, who all suffered serious injuries, have since been discharged.

A 16-year-old from Southampton has been arrested on suspicion of attempted murder. Police have been given an extra 36 hours to question a 16 and 17-year-old, also from the city, who were held on Monday morning on suspicion of the same offence.

A 16-year-old boy from Bristol remains in custody having been arrested on suspicion of attempted murder on Monday night.

The five boys who were stabbed had been invited to attend the supervised party.

Hampshire police said officers had carried out searches at three addresses linked to those arrested, two in Southampton and one in Bristol.

The force said several items had been seized, “forming part of our continued investigation”.

It added since the investigation began, a number of witnesses had got in touch and officers had spoken to many of them.

Those who had already been in touch should wait to be contacted.

Anyone with information is still being urged to come forward.

The force said “no matter how small it may seem to you, it may be key to our inquiries”.

Two churches in Chandler’s Ford said earlier in the week they had opened their doors to offer support.

St Boniface in Hursley Road is open 09:00-17:00 through the week, while St Martin in the Wood in Queen’s Road will open Wednesday from 15:00 to 17:00.