A primary school in Poland had to be evacuated after a nine-year-old boy brought a live hand grenade to a 'show and tell' session.

The pupils had been asked to bring something interesting into the classroom to show their classmates.

Nine-year-old Piotr Ernst, from Trzebnik, decided that a hand grenade from his dad's collection of WWII memorabilia was the perfect thing.

When later questioned by police, the youngster's father, Fryderyk, said he had dug up the grenade along with other WWII artifacts that he had found using a metal detector in woods near his home.