- What you see in the pictures is damage from an explosive charge, it is not a hand grenade, says Henric Östmark.

It was on Monday that there was an explosion in a gate in Grimsta in Vällingby.

The entrance was destroyed and several window panes were broken.

Henric Östmark is head of department for "Weapons, protection and security" at the Total Defense Research Institute, FOI, and has watched films from the damage in the gate.

According to him, what you see is damage caused by explosives.

Hand grenades, dynamite and homemade bombs

He notes that there are different types of explosives that are used on occasions like this.

- The first is hand grenades, which come above all from the Balkans.

The second is stolen civilian explosives such as dynamite.

The third is homemade bombs but the police have worked hard to control the substances needed for them.

Therefore, it is more difficult to make them now.

Stolen explosives from construction sites

Explosives are used, among other things, in the construction industry, and their theft from construction sites has been a problem for many years.

The police suspect that stolen explosives were used, among other things, in the powerful explosion in Gothenburg in 2021. Expert Dan Loyd, professor at Linköping University, then explained how explosives end up in the hands of criminals.

- It takes less knowledge to carry out an explosion than to shoot someone, he said then.

Hear more of the interview in the clip below.

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Hear from Dan Loyd about how criminals can get hold of explosives - and what has been done to prevent it.

Photo: TT