This story was updated at 12:37 p.m. EDT with reports of the arrests made.

After a rare case of deadly gun violence erupted in one of Europe’s safest capitals Sunday afternoon, three suspects entered a police station and were arrested on suspicion of their involvement. One person died, and three others were injured in Rinkeby, a neighborhood in the Swedish city of Stockholm, according to Swedish authorities, and just three hours later, three suspects turned themselves in, Swedish Television News reported.

According to one eyewitness account, cited by The Local, two men, one armed with a gun, the other with a knife, chased down a man before stabbing and shooting him. The gunshots ricocheted into bystanders, who were treated for minor injuries at a local hospital. Police have cordoned off the area and are still looking for the unidentified suspects.

“We regard it as an extraordinary event,” said Stockholm police spokeswoman Eva Nilsson.

Rinkeby is one of Stockholm's most ethnically diverse neighborhoods, and it is also considered by locals to be one of the most unsafe neighborhoods in all of Sweden. According to the ICE Project, which examines European cities at a neighborhood level, educational attainment and income levels lag far behind the capital’s average. It also has been, in recent years, the site of severe unrest. Thirty fires were set in the neighborhood during riots that swept through Stockholm in 2013.

Despite its reputation as an unsafe part of town, gun violence there, or anywhere in the country, is unusual. Sweden has some of the toughest gun laws in the world: adults cannot own or purchase guns without licenses, which can only be obtained through an application process that takes months. Sweden also has one of the lowest murder rates in the world. According to statistics compiled by the United Nations, Sweden’s murder rate is five times lower than that of the United States. Last year, there were just 87 cases of lethal violence confirmed by Sweden’s official crime prevention agency.

While authorities have not revealed any possible motive for the attacks, Sweden is currently dealing with a record surge in hate crimes. In 2014, hate crimes rose 14 percent, the highest single-year increase ever recorded in the country.