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(CNN) - Five people were stabbed Friday at a shopping center in Manchester, northwest England, according to police.
Greater Manchester police said in a statement that the anti-terrorist police led the investigation of the incident at the Arndale Mall and that a 40-year-old man had been arrested on suspicion of serious assault.
The police added that since they are still “initial stages”, they are “leaving open the motivation for this terrible incident and the circumstances”.
Witness Freddie Houlder, 22, who was buying shoes at the time, told CNN he "heard screams" before a woman ran into the store and "said someone tried to stab her."
"She said this guy was trying to stab random people," said Houlder. "We were locked in the store for about 20 minutes, and we were finally allowed to leave."
A spokesman for the Northwest Ambulance service told CNN previously that they had received "multiple" calls for help at 11:17 am local time and that several people were being treated for emergency services.
The spokesman added that a "several resources", an ambulance, two dangerous response vehicles and a doctor, had been deployed at the Arndale Center.