norah: prime minister netanyahu stands firm in his mission to destroy hamas as the situation in gaza grows desperate. despite the near constant heavy bombardment of gaza, hamas has shown itself capable of firing back. this just happened this morning. residents here say a rocket came right through the window from the direction of gaza, caused all this destruction. anti-semitic incidents on the rise around the world. hundreds storm a russian airport looking for israeli passengers. back here at home, online threats against jewish students at cornell. the alarming spike. new details in the maine mass shooting. why police were sent to the gunman s house for a health and welfare check before the massacre that killed so many. the makeshift memorial to the 18 victims are growing as this community starts to heal. norah: tonight, tributes for matthew perry are pouring in, plus why it could take weeks to find out the cause of the sitcom star s sudden death. warning for those w