Israel has carried out 21 air strikes against Gaza
since last Tuesday [AFP]
Israel is threatening to step up military action in the Gaza Strip unless Hamas stops its rocket attacks on southern Israel.

It follows a week of fierce internal fighting between Palestinian factions in Gaza which left at least 50 people dead.

Since last Tuesday, Israel has carried out 21 air strikes against Gaza.

It says more than 120 rockets have been fired from Gaza into Israel.

Do the air strikes signal a change in Israeli strategy, and what does this new escalation of violence mean?

Find out on Inside Story at 17.30GMT on Al Jazeera English

Watch Part One here:

Watch Part Two here:

To contact us click on 'Send your feedback' at the top of the page

Watch Al Jazeera English programmes on YouTube