Hamas says Israel's heavy bombardment of the Gaza Strip has killed 13 hostages, including foreigners, held by the group in the last 24 hours.
NBC News has not verified the claim.
Hamas is holding dozens of people, both military and civilians including Americans, after taking hostages during its bloody incursion into Israel last weekend. Many of them are believed to have been taken into Gaza.
The Israeli military sent one evacuation order directly Friday morning, warning the residents of Gaza City to flee south in the narrow coastal territory, which is just 25 miles long.
Get top local stories in Philly delivered to you every morning. Sign up for NBC Philadelphia's News Headlines newsletter.
Israel said it needed to target Hamas’ military infrastructure, much of which is buried deep underground. Spokesperson Jonathan Conricus said the military will use “significant force” while making “extensive efforts to avoid harming civilians.” He said residents would be allowed to return when the war is over.