Two people have been taken to hospital after an incident at Currys in Northfield Avenue this afternoon.
The ambulance, police and fire service attended the scene at about 3.30pm following a 999 call.
It was reported that customers had come into contact with a noxious substance. This was said by some witnesses to be pepper spray although that has not been confirmed by the authorities.
Two people were taken to Kettering General Hospital by ambulance as a precautionary measure.
It is not thought at this time that there are any life-threatening injuries.
Several members of the public could be seen with blankets around their shoulders outside the store at 5pm, and large bottles of a clear substance had been poured on the ground outside the store.
Initially the incident was being treated as a major incident but it has now been downgraded.
One person who witnessed the emergency response said: “There was a cordon across the whole car park. I’ve never seen so many hi-vis vests in one place.”
The area was taped off while customers were treated but the wider cordon has now been lifted.
An East Midlands Ambulance spokeswoman said: “We received a call at 3.44pm on 15 February from our colleagues in the police force requesting medical assistance at a commercial premises in Belgrave Retail Park in Kettering.
”We sent two paramedics in ambulance cars and two crewed ambulances. Two patients were taken to Kettering General Hospital.”