The attack, which took place on June 25, 2022, resulted in the deaths of two people and left nine others seriously wounded.

According to the Oslo District Court, Zaniar Matapour opened fire at three locations, targeting primarily the London Pub, a popular gay bar. Using a machine gun and a handgun, Matapour shot 10 rounds and eight shots into the crowd. The court stated that Matapour had been radicalized for several years and had pledged loyalty to the Islamic State group.

The 30-year sentence handed to Matapour is the highest penalty since Norway's terror legislation was amended in 2015. While he may request parole after 20 years, his release can only be considered if he is deemed no longer a threat to society.

Prosecutor Aud Kinsarvik Gravas expressed satisfaction with the verdict, calling it "the right outcome" and "a historically severe punishment." Matapour's lawyer, Marius Dietrichson, regarded the sentence as harsh and confirmed that they are considering the possibility of appealing the decision.

Survivors of the attack, such as Espen Evjenth, who was struck by a bullet in the forehead at the London Pub, expressed relief at the verdict. Evjenth described it as "a great relief" for the victims.

During the trial, extensive video evidence of the attack was presented to the court. Matapour, who had pleaded not guilty, was examined by a court-appointed psychiatrist and deemed mentally sound at the time of the attack.

The trial, which began in March and ended on May 16, shed light on the terror-motivated nature of the shooting, with both the prosecution and the defense agreeing on this point. However, Dietrichson argued that his client was provoked by an individual pretending to be a high-ranking ISIS member, who was later revealed to be an E-Tjenesten agent. Matapour claimed to have been coerced into carrying out the attack.

Following the incident, a Pride parade in Oslo was canceled due to concerns over security. The attack shocked the nation, as Norway has a relatively low crime rate but has witnessed a rise in lone wolf attacks in recent decades. One of the deadliest acts of violence occurred in 2011 when a right-wing extremist killed 69 people on the island of Utoya after detonating a bomb in Oslo, resulting in eight deaths.

Although four individuals are suspected of complicity in the LGBTQ+ festival attack, no charges have been formally filed against them at this time.

The verdict, electronically delivered rather than read in court, will be presented to Matapour while he serves his prison sentence.