An explosion shook Malmo, Sweden on Sunday hours after a gun attack near a soccer stadium.

BREAKING | Explosion rocks city of #Malmo in #Sweden hours after gun attack. May injured reported. pic.twitter.com/ErzMKRh9aN

A suspicious device was also discovered by police in Gothenburg.

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Summary of Sweden tonight. -Mass shooting in Malmö. -Massive explosion in Malmö. -Suspicious device destroyed by Police in Gothenburg #Malmo

Express.co reported:

POLICE are on high alert after an explosion rocked Malmo, Sweden just two hours after a gun attack left several people injured.

Witnesses reported hearing 20 gunshots during a football derby at around 7pm local time.

One eyewitness claimed the shots were fired by people in an Audi which drove off at high speed.

Police found shell casings at the scene in Censorgatan and say the suspects may have escaped by moped.

Officers said four people were shot in the attack and they are treating the incident as attempted murder.

Witnesses told Sweden’s Expressen newspaper the shots were fired in bursts of three rounds, suggesting that it is automatic weapon used in the shooting.