Palestinians who fled an ongoing Israeli raid in and around Gaza's main hospital describe days of heavy fighting, mass arrests and forced marches past dead bodies and flattened buildings. The Israeli military says it has killed over 170 militants and detained about 480 suspects in the raid on Shifa Hospital that began Monday. It portrays the raid as a heavy blow to Hamas and other armed groups that it says had regrouped in the hospital compound. But the heavy fighting also highlights the resilience of Palestinian armed groups in a heavily destroyed part of Gaza first targeted in the earliest weeks of the war.