Bomb squads are at Largs Yacht Haven following reports of 'an item found on a boat' within the North Ayrshire marina.
Police were called to the town's Irvine Road at around 3.30pm on Sunday. Explosive Ordnance Disposal (EOD) and HM Coastguard were also sent to the scene.
The marina was evacuated 'as a precaution' and the road was sealed off by police. As of 7pm, nobody had been allowed back into the site and Irvine Road was still closed.
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No injuries have been reported at this stage. Police did not disclose the nature of the alleged item on the boat, nor the type of vessel allegedly involved.
One stricken visitor claimed that 'four pontoons' were 'cordoned off' by officers as a 'bomb disposal van' arrived at the marina.
They wrote on social media: "Just leaving Largs Marina, four pontoons have been cordoned off by police. A bomb disposal van has arrived, blue lights flashing."
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Police Scotland confirmed their attendance at the scene to Glasgow Live on Sunday evening.
A force spokeswoman said: "At around 3.30pm on Sunday, September 11 we were called to Largs Yacht Haven, Irvine Road, Largs, to a report of an item found on a boat. Officers are in attendance alongside EOD (Explosive Ordnance Disposal).
“The area has been evacuated as a precaution and the road is currently closed.”
HM Coastguard drafted in crews from Largs and Ardrossan to 'assist police'. Crews remain at the scene.
A spokeswoman told Glasgow Live: "We are assisting the police with an incident, but you'll have to speak to them for further information. What I can tell you is that Largs and Ardrossan coastguard rescue teams have been sent to assist."
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