At half past four a burning band was placed next to the entrance to Tensta's national office.
The fire could be extinguished before it spread in the building and the police had a first investigation into attempts at serious fires.
Only 20 minutes later the box was broken to Tensta Town Hall Administration in Lunda where someone placed a band in the room and pointed out.
"It's no more than a kilometer in between, so it's reasonable to suspect that there's a connection," says Fredrik Nyhlén, Chief Officer of the Stockholm Police.
Technical research will be carried out during the day.