Nine children and two adults have been taken to hospital after a reported chemical leak in a swimming pool.
The incident happened at Everyone Active sports centre in Vale Farm, Wembley, on Thursday afternoon.
London Ambulance Service said they treated nine children and two adults at the scene before taking them all to hospital, before later saying a chlorine leak was found in the learner pool on the ground floor of the three-storey building.
They added firefighters operated for about two hours, and “ventilated the area and monitored the levels of fumes until there were no elevated readings”.
“Around 150 people left the building before the arrival of the brigade,” the London Fire Brigade added.
“The brigade was called at 1.42pm and the incident was over for firefighters by 3.43pm.
“Two fire engines, two Fire Rescue Units and around 20 firefighters from Northolt, Wembley, and Euston fire stations attended the scene.”
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The Metropolitan Police added earlier: “We were called at 1.40pm to reports of a chlorine leak at a pool in Watford Road, Wembley.
“Officers, the London Ambulance Service and the London Fire Brigade are in attendance.
“The leisure centre has been evacuated as a precaution and road closures are in place.”
Vale Farm Sports Centre said on their website that the pool “remains closed until further notice”.