Nottinghamshire Police have said that they are keeping an “open mind” over the motive for the 31-year old man who was arrested over the attack in Nottingham.
Two people were found dead in the street and in another location one more person was found killed and three people where mowed down by a van and are being treated in hospital.
Nottinghamshire Police have said on Tuesday afternoon they are now working alongside their counter-terror colleagues to “establish the facts” of what did happen and why.
Chief Constable Kate Meynell said that they are in the “early stages” of their investigation and are working with counter terror police as this is what they “would normally do” in crimes of this nature.
Chief Constable Meynell said, “This is a tragic series of events which has led to the lives of three innocent people being taken and left another member of the public in a critical condition in hospital.
“My thoughts are with all the families affected by this shocking incident, and we will be working extremely hard to understand exactly what has happened.
“We are at the early stages of the investigation and need to determine the motives behind these attacks and will keep the public updated as soon as we are able to say more.
“We are keeping an open mind as we investigate the circumstances surrounding these incidents and are working alongside Counter Terrorism Policing to establish the facts – as we would normally do in these types of circumstances.
“We do have a man in custody who has been arrested on suspicion of murder. Currently, we do not believe there is anyone else involved in this incident.
“It is safe to go into the city centre but there are a number of streets that will remain closed including Ilkeston Road, Magdala Street, Milton Street and Maple Street. This is so officers can gather evidence in order to understand what has happened.”