It was on Monday afternoon that the police were alerted that a man in his 55s had been injured.
A free police officer witnessed the incident, and ran after the perpetrator.
Several police patrols were alerted to the scene and the suspected perpetrator, a man in his 35s, could be arrested.
The injured man was taken to hospital by ambulance, and his condition is unknown.
Dog patrols search the place to find the suspected shelter.
A preliminary investigation into attempted murder has been launched.