Swedish news agency TT said the incident happened in Malmo just after 8pm and quoted the city's police department saying "there is no reason for the public to worry". According to local media, the attack took place in the downtown Drottninggatan area.
Early reports indicate that four people have been shot.
Local outlet Aftonbladet said the shootings took place next to a police station so officers were on the scene immediately.
Rapper XXXTentacion shot dead in his vehicle
He was facing more than a dozen felony charges, and prosecutors accused him of witness tampering. On Monday, the rapper had been at RIVA Motorsports checking out inventory, when he was shot.
The man reportedly fired an automatic weapon at the crowd, who were celebrating Sweden's 1-0 victory against Korea, this evening.
"There are no signs that this is terror-related", said police spokesman Fredrik Bratt.
"Things move fast when criminal networks start shooting each other". We do not want to see that.
Video game addiction is now officially recognised as an illness
The ICD defines gaming disorder as a pattern of persistent or recurrent gaming behaviour, which may be online, or offline. It is not yet clear exactly when treatment for the mental health condition will be available on the NHS.
The police lacks adequate resources to combat the scourge of crime that is sweeping parts of the country, Swedish Democrats party member Nima Gholam Ali Pour told RT.
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(Updated) Belgium outclass Panama in 3-0 win
Panama may not have been as strong on the ball, but their structure and composure off the ball was enough to keep Belgium at bay. Panama's Luis Tejada, right is faulted by Belgium's Kevin De Bruyne during the group G match between Belgium and Panama .