St. Paul police and fire crews cordoned off the Cathedral of St. Paul after a bomb scare early Saturday afternoon.

Police spokesman Steve Linders said a trespasser evidently lit paper materials on fire inside the Cathedral. One of his possessions concerned authorities, so out of “an abundance of caution,” a bomb squad went through the cathedral to make sure it was safe.

Fire officials turned cyclists, pedestrians and vehicles away at the intersection of John Ireland Boulevard and Marshall Avenue for about an hour before the roads were opened again.