Story highlights Raids came after possible threats to football fan gatherings, state broadcaster reports

Terror investigation led to raid, Belgian prosecutor's office says

(CNN) Belgian authorities questioned 40 people and arrested 12 of them in an overnight raid related to a terrorism investigation, the federal prosecutor's office said.

The operation Friday into Saturday included searches of dozens of houses, according to a statement from the prosecutor's office.

The searches were spread through 16 municipalities.

"The investigatory results necessitated an immediate intervention," the prosecutor's office said. "The investigation continues. In the interest of the investigation, currently no further details can be given."

Belgian state broadcaster RTBF reported Saturday that the overnight raids were made after messages were intercepted indicating attacks were being planned. The possible targets were places where Belgian football fans congregate to watch Euro 2016 games.

Read More