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.

Casper Ruud captured the Stockholm Open title with a commanding 6-3, 6-2 victory over Ugo Humbert in a final that lasted just 68 minutes. The Norwegian second seed dominated throughout the match, dropping only two points on his serve in the first set and just one point in the second set. After breaking Humbert early in both sets, Ruud comfortably served out the match to claim his second title of 2025, following his earlier Masters 1000 victory in Madrid.

The victory came amid growing concerns about player welfare on the ATP Tour, highlighted by Holger Rune's season-ending injury during the tournament's semifinals. Rune had started strongly in Stockholm, reaching the semifinal round with victories over Marton Fucsovics and Tomas Martin Etcheverry before suffering a torn Achilles tendon that forced his withdrawal from the match against Humbert. The injury abruptly ended Rune's season, preventing his potential qualification for the season finale.

Ruud addressed the injury concerns in post-match comments, expressing frustration with the demanding tournament schedule. "It's very demanding when you go directly from tournament to tournament," Ruud stated. "Holger was in Shanghai last week, and when something is so demanding, something like this can unfortunately happen. We're all in some kind of risk zone when we step onto the pitch." The Norwegian added that while he couldn't confirm a direct connection between Rune's injury and the schedule, "in a way, all injuries are probably because of the tough schedule."

The concerns about player workload extend beyond Ruud's comments, with world No. 9 Jack Draper recently requesting the ATP Tour to reassess its packed calendar. Players have emphasized the need for a more manageable schedule to ensure long and healthy careers. Ruud acknowledged the physical demands, noting that players are "really pushing our own limits at the moment" and expressing sympathy for Rune's unfortunate situation while wishing him a speedy recovery.