A Cheltenham resident, 29, has been detained on suspicion of terrorism-related offences.
The news was confirmed by Gloucestershire Constabulary this evening.
The arrest relates to an altercation that occurred outside a gym in Tommy Taylors Lane, Cheltenham, on Thursday at around 9.15 p.m.
A woman was stabbed and suffered critical wounds.
She was rushed to the hospital for treatment, and her condition is stable.
Police say the man has been arrested on suspicion of the commission, preparation or instigation of terrorism contrary to Section 41 of the Terrorism Act (2000), as well as on suspicion of preparing acts of terrorism under Section 5 of the Terrorism Act (2006).
Assistant Chief Constable Richard Ocone of Gloucestershire Constabulary said: ‘I would like to reassure those living locally or visiting the county that we believe this was an isolated incident and we are not aware of any wider threat to members of the public.
‘We are working closely with our partners in Counter Terrorism Policing.
‘We appreciate that an incident of this nature may be concerning and we would encourage people to contact us via 101 with any additional information they may have about the incident.’