A woman suffered serious injuries after being hit by a falling hay bale outside a village pub in Lancashire.
Two others were also hurt after the straw bales fell from a passing tractor on Sunday afternoon.
The woman, in her 60s, from Bolton, was sat outside the Manor Inn in Cockerham, near Lancaster.
She suffered a suspected spinal injury and remains in a serious condition in hospital.
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Two men - one from Bolton and another from Forton in Lancashire - in their 60s were treated for minor injuries.
No arrests have been made.
Police are appealing for anyone who saw the incident, or the Zetor tractor in the moments before it happened, to get in touch.
Sgt Martin Wilcock, from the Lancashire Police TacOps Unit, said: "Several people were injured as a result of this incident and we are working hard to establish exactly what occurred.
"We are asking anybody with information about it to get in touch with us as soon as possible. Perhaps you saw it happen, or perhaps you saw the tractor shortly before the incident occurred."
Anybody with information is asked to contact police on 101 quoting log number 936 of August 25.
