"Each one of us is responsible for the deaths of our oppressed people in Gaza and dozens upon dozens have died due to this oppressive blockade," the speaker, whose voice resembled that on previous bin Laden tapes, said.
Commenting to reporters on board Air Force One on the impact of Bush's visit, Secretary of State Condoleezza Rice said: "This is really a two-speech trip, not a one-speech trip.
"Today (Bush) had a chance to elaborate on that vision for the Palestinians."
THIRD VISIT TO REGION?
Despite little sign of significant advances toward peace on Bush's second trip to the region this year, his national security adviser, Stephen Hadley, insisted Israeli and Palestinian negotiators had been making "tangible progress", and he left the door open for a third presidential visit.
Rice also said Israeli and Palestinian negotiators were privately discussing an agreement and the talks would intensify.
Bush, who met Palestinian President Mahmoud Abbas in Sharm el-Sheikh on Saturday, sought broader regional support for the peace process and urged Arab states to "move past their old resentments against Israel".
Bush's trip follows a U.S.-hosted conference in Annapolis, Maryland, in November. Since then, talks have bogged down over Israeli settlement expansion in the West Bank and violence in and around the Gaza Strip, where Hamas cross-border rocket fire has triggered a tough Israeli military response.
During his trip, Bush also urged Arab leaders to stand by Lebanese Prime Minister Fouad Siniora against Hezbollah and to shun Iran over its nuclear programme. Iran says it wants nuclear technology only for peaceful purposes.
He called on Arab governments to free all "prisoners of conscience" and open up political debate.
"Too often in the Middle East, politics has consisted of one leader in power and the opposition in jail," Bush said.
Reflecting concern over record oil prices during a presidential election year, Bush also warned Arab oil producers their supplies were limited and they must diversify their economies. His comments follow a visit to Saudi Arabia where he won a modest increase in oil output.
