Several children at a school in the multicultural Swedish city of Malmö discovered explosive material in a sandbox — the latest discovery of explosives in the city in recent years.

The explosives were discovered by the children at the Sorgenfriskolan elementary school, located in near the centre of the city, Sveriges Radio reports.

The principal of the school, Mickael Westerlund, sent out a message to local parents saying that janitorial staff had searched the premises of the school to see if any other material had been hidden but they did not find anything else.

Large Explosions Rock Apartments in Swedish No-Go Suburbs https://t.co/IpYK86xtx8 — Breitbart London (@BreitbartLondon) January 23, 2020

Some of the parents of the children, however, have been less than enthusiastic about the incident, such as Per, the father of two boys who attend the school. “It is extremely unfortunate and bad for the whole of Malmö,” he said.

Another parent named Cecilia told Sveriges Radio: ” I think it’s dumb not to go out with more information.”

The discovery comes just under three years since a hand grenade was discovered in the Pildamma park in the Kronoborg area of the city by police, along with a cache of other weapons.

A year later in 2018, another hand grenade discovery in Stockholm’s Varby Gard subway station led to the death of a 60-yar-old man, who picked up the object not realising what it was, after which it exploded.

The grenade blast also wounded a 45-year-old woman who was taken to a local hospital.

Sweden: Just Seven Convictions After Year of Over 250 Explosions and Bombings https://t.co/IjJl84CS01 — Breitbart London (@BreitbartLondon) January 28, 2020

Sweden has seen a massive rise in bombings and explosions within the last year, with newly released statistics showing at least 257 incidents in 2019 — an increase of 59 per cent compared to the year before.

Despite the surge in cases, convictions have been scarce, with broadcaster SVT noting that just seven people had been convicted for explosion-related crimes last year.

‘What’s Going On?’ – BBC Wakes Up to Sweden Bombing Epidemic Years After Breitbart https://t.co/3snOCjhI9r — Breitbart London (@BreitbartLondon) November 13, 2019