Finland’s interior minister says a man who killed nine people in a school shooting was questioned by police a day before the massacre but released.

Anne Holmlund says the gunman was detained for questioning on Monday about YouTube postings in which he is seen firing a handgun. She says police released him because they had no legal reason to keep him detained.

She says the man used a 22-millimeter caliber handgun in Tuesday’s attack in Kauhajoki, 180 miles (300 kilometers) northwest of Helsinki. Holmlund says he got the license for the gun in August.