Well, people should note that the West Bank was under Jordanian control and therefore the Palestinians were technically internal refugees. They didn't come from outside though they did "swell the refugee population" in a reduced geographical area.

The legal claims on the West Bank are a little more complex than that, though. This is the Middle East after all:

Allied powers allocated the area to the British Mandate of Palestine. The 1948 Arab-Israeli War saw the establishment of Israel in parts of the former Mandate, while the West Bank was captured and annexed by Jordan. The 1949 Armistice Agreements defined its interim boundary. From 1948 until 1967, the area was under Jordanian rule, and Jordan did not officially relinquish its claim to the area until 1988. Jordan's claim was never recognized by the international community, with the exception of the United Kingdom. The West Bank was captured by Israel during the Six-Day War in June, 1967. With the exception of East Jerusalem, the West Bank was not annexed by Israel.

(Source: Wikipedia)

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