Police investigating the crash on the M5 in which seven people died have appealed for video footage of a nearby firework display.
Avon and Somerset Police said officers were still trying to piece together what happened near the motorway before the accident on the northbound carriageway near Taunton on 4 November.
Two lorry drivers and a father and daughter were among those killed in the pile-up.
Officers want to establish whether smoke from the firework display at Taunton Rugby Club might have been a factor in the crash, which happened in foggy and wet conditions around 8pm.
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