the threat here in the u.s. has been raised to a whole new level as a result of the israel hamas war. for one of the senators in that room, the threat is already hitting very close to home. one nevada man just arrested for allegedly making antisemitic calls to the senator. one chilling voice mail referred to finishing quote, what hitler started. our nbc news reporters are following all of the latest developments and we begin with the war in gaza and new pictures showing the site of a massive explosion at a refugee camp just outside of gaza city. raf sanchez is reporting from israel. what do we know about this? so, chris, this explosion happened at the refugee camp, the largest of the eight in gaza. it is as you said in the northern end of the gaza strip. it s close to the israeli border. we are seeing just this scenes of enormous destruction there inside that refugee camp. a local hospital official tells us dozens of people were killed. we don t have an exact number, but do