hello everyone. thank you for joining us. i m fredicka whitfield in atlanta alongside jim sciutto in israel. we begin in gaza where israeli troops continue to advance as officials say the second stage of their war with hamas has begun. moments ago we learned that president joe biden spoke with israeli prime minister benjamin netanyahu. their conversation comes as national security adviser jake sullivan warned there s an elevated risk of conflict expanding across the region. the idf said their air strikes hit more than 450 hamas targets in the last day including command centers, observation posts and missile launch sites. sources tell cnn that one strike hit a mosque killing 13 people and leaving dozens of others injured. new video from inside gaza published by an israeli newspaper shows idf soldiers raising israel s flag on a hotel roof. cnn has asked the israel defense forces for comment on the video. an analysis by cnn shows that israeli troops have advanced at least two mi