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According to attorney Fatmeh el-Ajou, the Israeli government said Ms. Maguire was banned from entering because she had been aboard a boat that tried to defy the Gaza blockade in June. Israel intercepted that vessel and deported its passengers.

Ms. Maguire, 66, is an outspoken champion of Palestinian statehood. Israel has banned other pro-Palestinian activists from entering, including Jewish-American linguist Noam Chomsky in May. The government later said that was a mistake.