Mobile anti-terror barriers which sound an alert during major incidents are set to be introduced in Edinburgh during festivals and events.
Officials at Edinburgh City Council plan to invest in new "hostile mitigation barriers" at key locations around the city.
Described as "fully flexible gates", the barriers are being tested by the local authority and improvements suggested before their introduction.
A report to the City of Edinburgh Council states: "Initial tests were very positive, slowing up vehicles and creating noise to alert any people in the area, and ideas for improvement and further testing have been discussed and are likely to be implemented.
"This will provide a number of fully flexible gates which can be deployed by council resources and which can provide a known level of protection to events in the city."
Locations for the mobile barriers to be used in are yet to be confirmed, but they are an addition to the more permanent National Barrier Asset (NBA) which remain in place at six locations in the city.
A City of Edinburgh Council spokeswoman said: "As a capital city and a major destination for festivals and events, appropriate measures are put in place every year to ensure the security of our crowded places.
"We were the first council to work with local police to devise and develop our own protection system, which is always reviewed to ensure it is fit for purpose."
The authority said the move was not in response to any particular threat but designed to enhance the strength and longevity of temporary barriers already available.
The mobile barrier system has been developed after talks with Police Scotland.
A Police Scotland spokeswoman said: "We work closely with event organisers to advise on safety in the run up to and during events and provide appropriate police resources when events are taking place."