CNN, quoting unidentified sources, reported one was a Moslem male who owns a livery car, in which a cache of weapons was found.
Meanwhile, Jewish community sources close to the case said that only one man, described as a Moslem fundamentalist, had been arrested.
A dozen shots were fired from two guns at a van carrying the rabbinical students as it approached and crossed the Brooklyn Bridge between Manhattan and Brooklyn.
Police denied reports that the gunman had shouted in Arabic "Kill the Jews," and they played down any link to last Friday's massacre by a Brooklyn-born Jew of 43 Moslem worshippers in a Mosque in the Israeli-occupied West Bank.
Two of the four students were in a critical condition Wednesday.
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