Israeli tanks pushed into southern and eastern districts of the Gazan city of Deir al-Balah for the first time on Monday, an area where Israeli sources said the military believes some of the remaining hostages may be held.
The area is packed with Palestinians displaced during more than 21 months of war in Gaza, hundreds of whom fled west or south after Israel issued an evacuation order, saying it sought to destroy Hamas capabilities and infrastructure.
Tank shelling in the area hit houses and mosques, killing at least three Palestinians and wounding several others, local medics said.
To the south in Khan Younis, an Israeli airstrike killed at least five people, including a husband and wife and their two children in a tent, medics said.
Israeli sources have said the reason the army has so far stayed out of the Deir al-Balah districts is because they suspect Hamas might be holding hostages there. At least 20 of the remaining 50 hostages in captivity in Gaza are believed to be still alive.