Police said a local specialized unit was on its way to the scene.
"We believe that there are several people still in the house and that at least one person is armed," said police spokesman Christer Johansson.
The injured man has been taken to hospital to be treated for minor injuries, according to police.
The are around the house in central Sollefteå has been sealed off.
A number of ambulances and rescue vehicles have been called to the scene.