Explosives experts have urged recycling staff to be extra vigilant after workers risked their lives taking a mortar shell (pictured) out of a skip.
Wyvern's Priorswood recycling centre in Somerset was closed at 2pm on Saturday February 12 after staff discovered a suspicious-looking device in a skip.
Before it had been established whether the 18-inch long mortar was dangerous, workers picked it up, took it to open land and covered it with a mattress.
The police and a crack Army squad were called and discovered it was empty so the centre was reopened at 4.45pm and no-one was hurt.
But ISSEE principle Alan Hatcher told MRW that live bombs are turning up all the time - and they could kill people if handled.
"A lot of these things are turning up," he said. "Squaddies bring back mementoes from conflicts and many soldiers kept souvenirs from the Second World War.
"Families are finding them in their attics and wondering what to do with them. So they are taking them to places like recycling centres. This is going to keep happening.
"Scrap metal merchants find things such as hand grenades and mortars, much of it quite disfigured with time.
"But some of these things will be live, and their components will have grown sensitive with age, so there will be a danger of them going off if handled."
Referring to the Priorswood bomb scare, Hatcher added: "This was dealt with very sensibly in the first instance. If you see something suspicious, cordon it off and leave it.
"But handling it was a huge no-no. If it had been live it could have gone off, and then there would have been fatalities."
Wyvern contract manager Brian Nicholls said: "A member of staff moved the bomb and placed it on open ground. But when it was moved we did not know it was a device."
General manager Chris Jonas added: "We have established emergency procedures for dealing with situations like this and our plans were professionally executed."