The attack on Tuesday - described by Sweden's prime minister as the "worst mass shooting" in the country's history - happened at a school for adults.

Around 10 people were killed in a school shooting in Örebro. The damage at the crime scene was so extensive that investigators were unable to be more definitive, said Roberto Eid Forest, head of the local police.

Swedish Prime Minister Ulf Kristersson and King Carl XVI Gustav have led tributes to the victims of a deadly shooting at an adult school in the city of Orebro. A police investigation is underway.

About 10 people, including the gunman, were killed on Tuesday at an adult education center in what Sweden’s prime minister called the country’s worst mass shooting. But a final death toll, a conclusive number of wounded and a motive hadn’t yet been determined hours later.

Around 10 people have been killed in a shooting at an adult education centre in Sweden, police say. More details are emerging of the attack, with the scene described as a "nightmare". Follow the latest.

At least 10 people have died and many were wounded during a school shooting at an adult education center in southern Sweden on Tuesday afternoon.

The king and queen visited the scene of the tragic event that occurred on Tuesday and Swedish flags were flown at half-mast to honor the victims.

Police said they do not know the motive but do not believe it is terrorism, adding they "had no warning sign" about the attack. Officers are working to identify the perpetrator and the victims.

Today's news roundup to get a lowdown of global and local events and developments. This live blog gives you the day's most important news on current affairs you have an interest.

Officials in Sweden have vowed to determine why a man killed 10 people, and apparently himself, in an unprecedented attack that's shaken their "society to its core."

"It is a very painful day for all of Sweden," Prime Minister Ulf Kristersson said in a statement posted on social media.