The official, Ezzat al-Rishq, is among a Palestinian delegation in Cairo where Egyptian mediators are racing to bridge the gaps ahead of the expiration of a temporary ceasefire at midnight.
"There is no progress in the negotiations. Chances of an agreement are evaporating, and we hold the Zionist occupation fully responsible for that," Rishq wrote on Twitter.
He said the Palestinian delegation had presented the Egyptian mediators with their final position, which was relayed to the Israelis.
Israel ordered its delegation to leave Cairo and renewed air strikes on Gaza after a military spokesman said rockets hit the south of the country, hours before the truce was to expire.