Oslo police have made four arrests following a hand grenade explosion in Pilestredet on Tuesday evening. The incident, which occurred at approximately 8:15 PM, involved one grenade that detonated and another that failed to explode but was safely handled by authorities. No injuries were reported, though police emphasized the significant damage potential of the explosion.

Two 13-year-old boys were initially taken into custody on Tuesday night, with two additional older teenagers arrested on Wednesday evening. The older suspects are both above the criminal age of responsibility and have been charged with involvement in serious illegal handling of explosives. Police confirm that the two 13-year-olds remain in the care of child protection services and will be interviewed again on Thursday.

Investigators are working under the hypothesis that the explosion is connected to conflicts between criminal actors. Police Inspector Grete Lien Metlid stated that the leading theory suggests the teenagers may have taken on a "violence as a service" assignment, carrying out the attack on behalf of others. The target appears to have been a business premises near the explosion site rather than specific individuals.

The investigation continues to examine potential connections to a separate kidnapping case involving a 24-year-old man last week. Police are exploring whether there might be a motivational link, given that the kidnapping victim reportedly has family ties to the business owner operating from the premises near the explosion site. Authorities have not commented on possible international criminal connections and emphasize that further arrests remain possible as the investigation progresses.

Mjällby AIF stands on the brink of securing the Swedish Allsvenskan championship, with their fate potentially decided during Sunday's heated Stockholm derby between Hammarby and AIK. The southern Swedish club could clinch the title without even playing if Hammarby drops points against their city rivals. This unprecedented scenario has created intense anticipation across Swedish football as the season reaches its dramatic conclusion.

In Bromölla, Mjällby's supporter club Sillastrybarna gathered at a restaurant to watch the Stockholm derby together, reflecting the nervous excitement surrounding the potential championship. "The feeling is that anything could happen today, but we're satisfied either way," said Kristofer Rasmusson, vice chairman of Sillastrybarna. The supporters acknowledged that while winning the title during another team's match would be unusual, it would still represent a remarkable achievement for the club.

Should Hammarby secure victory against AIK on Sunday, Mjällby's championship aspirations would extend to Monday's away match against IFK Göteborg. In that scenario, Mjällby would need to defeat the Gothenburg side to claim the SM-gold. Maximilian Damm, who is live-reporting on Mjällby's title chase, expressed confidence in the team's abilities, stating, "As soon as they get to play a match. That is, on Monday against IFK Göteborg away. It's hard not to be impressed by how MAIF approaches matches, and there's no reason not to believe they won't win on Monday."

The Monday encounter against IFK Göteborg presents its own challenges, with historical data showing low-scoring affairs between the two clubs. The last five meetings have produced just one goal per match, with Mjällby holding three victories to IFK's two. Despite this history, both teams have significant motivation - Mjällby for the championship and IFK Göteborg for European qualification spots and honor. The match kicks off Monday at 19:10, potentially crowning a new Swedish champion.