A Hamas spokesman said on Sunday demands to recognize Israel and previous peace deals have prevented his movement and President Mahmoud Abbas' Fatah faction from striking a national reconciliation agreement, Xinhua reported.
At Cairo-hosted talks aimed to restore national unity among Palestinian factions, main rival Fatah and Hamas agreed on forming a unity government but failed to agree on its political platform.
"We reject imposing the American agenda and the Quartet's conditions on the Palestinian national dialogue," said Hamas spokesman Mushier al-Massri.
The Quartet of Middle East peace, which comprises the United States, the European Union, Russia and the United Nations, demands any upcoming Palestinian government to recognize Israel, renounce violence and accept peace deals.
The unity government is sought to reconcile the geographically separated Gaza Strip and West Bank, politically cut off in June 2007 after Islamic Hamas movement seized control of the impoverished Gaza by force.
Hamas, which enjoys the majority in the parliament, says it can not accept or join any government that recognizes Israel.
Egypt, which serves as a mediator between feuding Fatah and Hamas, has proposed the formation of a government acceptable to the international community headed by President Abbas to overcome the crisis.
Hamas said it would respond to the offer in a new round of talks that will be launched on April 26 in Cairo.