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.

About 10 people including the gunman have been killed at an adult education center in what Sweden’s prime minister called the country’s “worst mass shooting.”

At least 10 people were killed in a school shooting in Sweden on Tuesday, with police officers confirming the suspected gunman also died after carrying out what is being described as the worst mass