A gunman opened fire at an adult education center in the Swedish city of Örebro on Tuesday, killing at least 10 people in what the country’s prime minister called the “worst mass shooting in Swedish history.

Police in Sweden said "about 10" people were killed in a shooting at an adult education school . The shooting occurred at Campus Risbergska in Örebro, Sweden, the city said in a statement. Police say the shooter is believed to have been killed.

Swedish police are investigating for a motive after a school shooting in the city of Örebro that has killed at least 10 people. NBC News’ Matt Bradley reports on what is known about the shooting.

Police said at least 10 people were killed at a school on Tuesday, in what has been described as the worst mass shooting in Sweden’s history. The suspected perpetrator also died.

A major police operation is underway in Örebro, Sweden, after five people were shot at an adult education centre. Armed police were scrambled to Risbergska School at lunchtime on Tuesday as terrified students hid under their desks and barricaded themselves in classrooms.

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.

A shooting occurred Tuesday at a school in Örebro, a city located 105 miles from Stockholm, leaving five victims hurt.

Five people have been shot at an adult education centre in Sweden, police have said, with four in the hospital. Authorities say that the danger wasn't over and urged the public to stay away from the school. The extent of the victims' injuries wasn't immediately clear. The adult education center is about 125 miles west of Stockholm.

Police say around 10 people have been killed in a shooting at an education centre in central Sweden, including the suspected gunman. Prime Minister Ulf Kristersson described Tuesday's attack at Risbergska school in Orebro,