Detectives hunting a man who stabbed a 62-year-old dog walker in the neck were last night questioning a suspect.
The 30-year-old man was arrested yesterday morning – two days after the apparently unprovoked attack in Oadby.
The man was being questioned about the attack on a man who was walking his dog in parkland off Bluebell Close in the town shortly before 8.45am.
The victim remained in hospital yesterday as officers continued their investigation.
Police described his condition as "stable".
The scene, which was cordoned off by police on Saturday, was opened to the public again the following day.
Several patches of ground, believed to be areas where the victim lost blood, were covered with a green powder.
Detective Constable Gary Dickinson said: "Despite the arrest, our inquiries continue in the area.
"We would encourage anyone who can assist in our investigation and hasn't yet spoken to the police to come forward.
"Incidents of this nature are extremely rare and we would like to reassure the community that we still believe that this incident was isolated."
Police said the wounded man was found by a member of the public who ran to nearest house to get and came across a nurse.
The nurse stemmed the flow of blood from the wound until paramedics arrived.
Detectives later said the nurse's swift action could well have saved the man's life.
Dog walkers in the area yesterday said the shock had spread through the community.
One, a 54-year-old man, said: "I haven't met anyone here who hadn't heard about what happened to that poor man at the weekend.
"There is a general shock in this area and everyone is praying that he makes a full recovery.
"I thought long and hard before I brought my dogs out here to walk because of the thought that a potentially dangerous man was on the loose.
"But then I told myself, 'I come here every day and I love it here. I shouldn't let this change the way I live my life'."
Another dog-walker, a 62-year-old woman, said: "It is an awful thing.
"Everybody is extremely shocked something so violent could happen in a beautiful area like this.
"All I have heard people saying here is they want the person who did this to be caught and that the injured man gets better quickly."
Anyone with information should contact Det Con Dickinson on 101, or call Crimestoppers, which is anonymous, on 0800 555 111.
