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(Image: DS/EXPRESSEN)

The explosion happened at a block of flats in Malmo, Sweden, with residents reporting seeing shrapnel flying through the air.

Police spokesman Calle Persson said: "We got calls from two people with five minutes apart.

"We think it's a hand grenade that's been detonated. National bombing protection has been alerted to the scene."

A bomb squad and police dog unit were at the scene.

So far, one man has been taken to hospital with shrapnel wounds to his leg.

Malmo is known as one of the most troubled areas of the country, with crime problems blighting the area.

(Image: EXPRESSEN)

There have been no arrests and the perpetrator is believed to be at large.

Mr Persson added that the incident was being treated as attempted murder.