An Army bomb disposal team was called in to detonate two antique fire extinguishers discovered in Edinburgh.
The devices, which contained small detonation charges, were made safe after they were found in the attic of an unoccupied property in Cramond.
The extinguishers were designed to self-activate in the event of a fire.
Manufactured in their thousands during World War Two, the extinguishers were designed to explode, scattering a fire-suppressing powder.
Police Scotland said in a statement: “Police in Edinburgh responded to an address in Trinity Road at around 8.40pm on Tuesday 13th August after two antique fire extinguishers with detonation charges were found within an attic space of an unoccupied house.”
Officers later confirmed that bomb disposal experts were called in and carried out a controlled explosion on Cramond beach.
A similar wartime extinguisher was found in Musselburgh in 2013.
At that time, the fire service said discoveries of Selfac extinguishers were not uncommon but warned that they remained dangerous.
“Some people hold on to them as antiques from the war and some are found in lofts of old houses but they can be highly unstable and can explode,” a spokeswoman said.
“They’re dangerous because they have a small detonator inside that reacts to heat or heavy movement so that’s why it was taken away to be destroyed.”
Patented in 1935, the Selfac “self-acting automatic fire extinguisher” was manufactured by the FE Proprietary Company of London.
It was described as “a grenade of the kind comprising a container filled with an extinguishing powder or liquid and a central bursting charge in a spherical or other cartridge”.
The firing mechanism is described in the patent.
It says: “The fuse is a quickmatch which extends into an inflammable cap secured on the tube and provided with igniting streamers.
“The latter extend through openings in a protective hood. The fuse is a slow match extending from the end of the quick match to a detonating cap.”