FILE - In this May 25, 2006 file photo, an Israeli with a flag on his back takes a picture of Arab residents as they are being prevented by police to cross the road around Jerusalem's Old City, in the Muslim quarter, during the Israeli celebration of the Jerusalem Day. The U.S. on Sunday, July 28, 2013 announced the resumption of Israeli-Palestinian talks following years of stalemate, after Israel's Cabinet agreed to release 104 Palestinian prisoners convicted of deadly attacks. The return to direct contacts between the sides gave U.S. Secretary of State John Kerry his first concrete achievement after months of shuttle diplomacy. AP Photo/Enric Marti, File FILE - In this May 8, 2013 file photo Israelis and Palestinians wave flags as Israelis march celebrating Jerusalem Day outside Damascus Gate in Jerusalem's old city. The U.S. on Sunday, July 29 announced the resumption of Israeli-Palestinian talks following years of stalemate, after Israel's Cabinet agreed to release 104 Palestinian prisoners convicted of deadly attacks. AP Photo/Sebastian Scheiner, File FILE - In this Dec. 14, 2007 file photo, a Palestinian man argues with an Israeli soldier during a demonstration against Israel's separation barrier at the village of Bilin, near the West Bank city of Ramallah. JERUSALEM (AP) - Israeli and Palestinian teams headed to Washington on Monday for preliminary talks on resuming formal negotiations after five years of stalemate. Both sides emphasized that many obstacles stand between them and a final deal on setting up a Palestinian state alongside Israel. Talks will be complex, said Israel's chief negotiator, Tzipi Livni. She said she was heading to the Washington meetings, which are to begin later Monday, "cautiously, but also with hope." Hanan Ashrawi, a Palestinian spokeswoman, said the upcoming talks are being held under more difficult conditions than previous negotiations. She cited the Palestinian political split, with Western-backed moderates and Islamic militants running rival governments, and the more hawkish positions of Israel's prime minister, Benjamin Netanyahu, compared to his predecessor. "But I think there is a recognition of the urgency," she said. If we don't move fast and decisively, things could fall apart. The preliminary talks in Washington were made possible after Israel's Cabinet on Sunday agreed in principle to release 104 long-held Palestinian prisoners, convicted of offenses including the killing or wounding of Israelis and the killing of suspected Palestinian collaborators. The prisoners are to be released in four stages, with each release linked to progress in negotiations. The resumption of direct Israeli-Palestinian contacts was a result of six months of shuttle diplomacy by U.S. Secretary of State John Kerry.