Israel struck more than 500 targets in Gaza overnight after Hamas killed hundreds in Israel over the weekend. More than 1,000 people have died, making it the deadliest conflict in the region since the Yom Kippur War of 1973. NPR's Aya Batrawy joins us. And, Johns Hopkins Middle East analyst Laura Blumenfeld joins us to discuss Israel's newly declared war on Hamas. Then, three days after Hamas attack in Israel, opposing groups are still fighting. Jim Walsh, senior research associate at the Massachusetts Institute of Technology's Security Studies Program, joins us to talk about the implications of the war.