Youtube videos of the shooter: http://www.iltalehti.fi/nettitv/?28011645
A Finnish student who shot dead several of his classmates after he opened fire in a vocational school north of Helsinki.
The attacker, a 20-year-old student at the school, was disarmed and is now dead, police said.
Officers said they would not know the number of students killed or injured for some time.
Fire department chief Ahti Yli-Mannila said: "There are dead people. We have not counted them. It's a big school."
A fire at the school was being tackled by his crews.
Local journalist Timo Huovinen told Sky News that students had just sat down to take an exam when the shooting began.
Terrified students were evacuated as shots were heard from inside school buildings in Kauhajoki, 120 miles from Helsinki.
The Kauhajoki Palvelualojen Oppilaitos, where the shooting occurred, is a vocational college for students aged 16 and over.
Around 200 students were in the school building when the gunman opened fire.
A video apparently posted by the gunman has since been found on video sharing website YouTube.
Clips of a man in a leather jacket firing a gun were uploaded five days before the shooting with the location given as Kauhajoki.
The posting included a message saying "life is pain. And you will fight alone in your personal war."
The incident comes less than a year after a massacre at a Finnish high school in Jokela, north of Helsinki.
On November 7, 2007, 18-year-old student Pekka-Eric Auvinen shot six students, the school's headmistress and a nurse before turning his gun on himself.
Finland has the third highest rate of gun ownership in the world, behind the US and Yemen.