Following the death of a senior official in Dubai, Hamas has blamed Israel and vowed revenge. But after coming under pressure for its refusal to sign a reconciliation agreement with its Fatah rivals, can Hamas really afford to engage in another round of violent confrontation?

Mahmoud al-Zahar is a co-founder of the organisation and one of its most senior leaders in Gaza. Stephen Sackur asks him if Hamas will show that they have undertaken a thorough investigation into the findings of the Goldstone report.

The full interview with Mahmoud al Zahar will be broadcast on Tuesday 2nd February.

BBC World News: 0330, 0830, 1530 and 2030 GMT.

And on the BBC News Channel at 2330 GMT.