Israel has been shelling Gaza from the sea and air as its bombardment of the coastal enclave moves into a fifth day.

One missile hit a media tower block in the centre of Gaza City, reportedly injuring six Palestinian journalists.

Israel says it still wants to hit hundreds of Gaza targets as it seeks to stop Hamas and other militant groups from firing rockets into Israel.

Gaza militants on Saturday fired dozens of rockets into Israel, including one at Tel Aviv that was intercepted.

Health officials in Gaza say 48 Palestinians have been killed so far. Three Israelis were killed earlier this week.