Pennsylvania State Police sent out an alert last week to its department and law enforcement partners as a reminder to be vigilant of persons who may try to impersonate police, fire and first responders in order to carry out an attack in the U.S., reports CBS News .
Pennsylvania State Police confirm that a memo was sent out, but was not related specifically to Pope Francis' visit. Pope Francis is wrapping up his trip in Cuba and arrives in the U.S. on Tuesday.