(Portland, OR)  --  A Portland fire lieutenant is being praised for his swift action to save several people during an explosion that rocked a north-west neighborhood.  Chief Mike Meyers says Lieutenant Peter St. John single-handedly ran into a building and pulled the fire alarms, warning people to quickly get out.  St. John was one of eight people hurt during the explosion that destroyed three businesses.   It happened when a construction worker hit a gas line.  No one was killed.