Israel has begun a ground operation with troops entering Gaza after a week of air strikes at Hamas targets.
Witnesses said armoured vehicles crossed into northern Gaza at four separate points, supported by helicopters.
Various buildings have been hit, such as this printing shop in Gaza City. The Israeli military said the intention was to take control of areas from which Palestinian militants have been firing rockets into Israel.
Hours before the ground offensive began, Israeli artillery was fired into Gaza for the first time since violence began a week ago.
As air strikes on Gaza continued, more buildings were damaged and at least 10 people were killed when a mosque was hit, local medics said.
More than 400 Palestinians have been killed and many injured during the week-long violence. The UN has warned of a humanitarian crisis.
Here, a Palestinian photographs an unexploded Israeli bomb, which landed in a house.