(Princeton, MN)  —  One person is dead and a man and woman are injured after home exploded in Princeton, north of the Twin Cities.  Police say the explosion happened yesterday just after noon in the one thousand block of Eighth Avenue North.  A 39-year-old woman and a 59-year-old man were taken to the hospital in unknown condition, and a third victim was found dead after the flames were extinguished.  Fire officials are investigating whether the explosion was the result of a gas leak or from a residential propane tank.