Ismail Haniyeh, a Hamas leader, said the meeting was part of consultations On the internal Palestinian situation and ensuring that the Israeli withdrawal from the Gaza Strip was "real and complete."
He told reporters after his meeting with Abbas the talks also focused on the frontiers between Gaza and Egypt.
Haniyeh said there was a unified Palestinian position that the borders should be only controlled by the Palestinians and Egyptians and for the Palestinians to have the freedom of movement without Israeli intervention.
Abbas was expected to visit the border later in the day, his third in the past four days, to inspect preparations for reopening the frontier with Egypt.
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