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In early April, an estimated 25,000 Arabs left the Haifa area following an offensive by the irregular forces led by Fawzi alQawukji, and rumors that Arab air forces would soon bomb the Jewish areas around Mt. Carmel. On April 23, the Haganah captured Haifa. A British police report from Haifa, dated April 26, explained that "every effort is being made by the Jews to persuade the Arab populace to stay and carry on with their normal lives, to get their shops and businesses open and to be assured that their lives and interests will be safe." In fact, David Ben-Gurion had sent Golda Meir to Haifa to try to persuade the Arabs to stay, but she was unable to convince them because of their fear of being judged traitors to the Arab cause. By the end of the battle, more than 50,000 Palestinians had left.
Tens of thousands of Arab men, women and children fled toward the eastern outskirts of the city in cars, trucks, carts, and afoot in a desperate attempt to reach Arab territory until the Jews captured Rushmiya Bridge toward Samaria and Northern Palestine and cut them off. Thousands rushed every available craft, even rowboats, along the waterfront, to escape by sea toward Acre (New York Times, April 23, 1948).
In Tiberias and Haifa, the Haganah issued orders that none of the Arabs' possessions should be touched, and warned that anyone who violated the orders would be severely punished. Despite these efforts, all but about 5,000 or 6,000 Arabs evacuated Haifa, many leaving with the assistance of British military transports.
Syria's UN delegate, Faris el-Khouri, interrupted the UN debate on Palestine to describe the seizure of Haifa as a "massacre" and said this action was "further evidence that the 'Zionist program' is to annihilate Arabs within the Jewish state if partition is effected."
The following day, however, the British representative at the UN, Sir Alexander Cadogan, told the delegates that the fighting in Haifa had been provoked by the continuous attacks by Arabs against Jews a few days before and that reports of massacres and deportations were erroneous. The same day (April 23, 1948), Jamal Husseini, the chairman of the Palestine Higher Committee, told the UN Security Council that instead of accepting the Haganah's truce offer, the Arabs "preferred to abandon their homes, their belongings, and everything they possessed in the world and leave the town."
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http://www.jewishvirtuallibrary.org/jsource/History/refugees.html