At least one person is reported to have been stabbed during three “serious incidents” in East Ayrshire.
University Hospital Crosshouse in Kilmarnock was placed in lockdown on Thursday evening, with ambulances diverted to University Hospital Ayr as police dealt with the unfolding events.
The three-hour lockdown was lifted shortly before 23:00.
The PA news agency said it understood at least one person was stabbed.
There was no official confirmation from Police Scotland.
Officers were called to the first incident at the Crosshouse site at about 19:45 on Thursday.
They believe another in the centre of Kilmarnock about 20 minutes later and a serious crash on the A76 may be linked.
The incidents are not being treated as terror-related.
In a statement on Twitter Police Scotland said there was n
It added that inquiries were at an early stage and that the areas involved have been cordoned off.
The second incident was on Portland Street, which is about two miles from the hospital, at about 20:05.
Officers were called to the crash on the A76, on the outskirts of the town, at about 20:30.
Local residents reported hearing sirens and a helicopter overhead shortly before 20:30.
On Friday morning, the hospital’s A&E department and main entrance were open and running as normal while two police vans full of officers remained outside with police tape around part of the car park.
Dr Crawford McGuffie, the medical director of NHS Ayrshire and Arran, said police had confirmed the risk to patients, staff and visitors to the hospital was minimal.
He added: “There remains a large police presence on the grounds of the hospital.
“We would like to reassure anyone coming to the hospital, in particular to any patients or staff coming on shift, that Police Scotland have confirmed it is safe to do so.