A powerful explosion in the southern Swedish town of Linkoping on Friday damaged buildings and lightly injured 25 people, police said.

The cause of the explosion was unclear but police said a bomb squad was on its way to the scene in downtown Linkoping and that they had opened a criminal investigation.

“There is nothing that indicates that this incident is terror-related, we do not see that,” police spokeswoman Asa Willsund.

Read more: Reuters