Israel has bombed two large high-rise buildings in Gaza City with dozens of homes and shops.
Police in Gaza say the 15-floor Basha Tower with apartments and offices was levelled in the attack. The second building, the Italian Complex with 72 apartments and 60 stores, was badly damaged.
The towers were evacuated before the attacks. A Gaza health official said 25 people were wounded in the strike on the Italian Complex.
Israel says it targeted sites linked to terrorists, but made no references to the two buildings.
This is the second time since the weekend that Gaza high-rises have been toppled in an apparent attempt to increase pressure on Hamas.