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The incident occurred in the eastbound lanes and prompted an extensive emergency response.
Reports indicate that a vehicle was travelling in the wrong direction, resulting in a serious crash with multiple vehicles. Emergency services, including paramedics and a
ambulance, are on the scene attending to those injured, with initial reports suggesting that several people have sustained serious injuries.
Hampshire Police closed both sides of the M3 to facilitate the emergency response, and a collision investigation is underway.
The road closures are expected to last through the night, with officials advising that the closures may extend into the early hours of Sunday.
Motorists currently held in the traffic will be released by Highways officers as soon as possible, and drivers are urged to avoid the area and seek alternative routes.
The public is advised to monitor traffic updates for further information as emergency teams continue their work on-site.
