A meeting scheduled between Mahmoud Abbas, the Palestinian president, and Khalid Meshaal, head of the ruling Hamas party, has been postponed, according to a senior Palestinian official.
"There are difficulties facing such a meeting and there are current mediations to try and resolve the problems," the Palestinian official said, without giving further details.
The official said it was possible that the meeting would be held Sunday.
Abbas, who leads the opposition Fatah party, was due to meet Meshaal in an attempt to end growing conflict between the two rival groups.
The meeting was to take place after Abbas had talks with Bashar al-Assad, the Syrian president.
Abbas and Meshaal were expected to discuss the names of the ministers for interior, finance and foreign affairs in a proposed Palestinian unity government.
Fatah and Hamas have tried for months to agree on a national unity government, in hope of ending a boycott by the
Tensions between the two factions, which had already claimed a number of lives, boiled over in the Gaza Strip in December, killing more than 30 people in that month alone.
However, violence has tapered off in the past couple of weeks.
Clashes in December began after Abbas called for early elections as a way of resolving the standoff with Hamas, which rejected the move.
Meeting with Syrian leader
Abbas's meeting with al-Assad reportedly ended amicably with the Syrian leader re-affirming his commitment to the Palestinian cause.
Briefing reporters in
He reported that al-Assad had told Abbas that he was "attached to Palestinian national unity and ready to support anything that could help reinforce it, as well as efforts to find an adequate solution to the Palestinian problem."