Three Fulbright scholars from Gaza are appealing to the US Secretary of State to reissue their entry visas. They were publicly revoked several days ago. Zuheir Abu Shaban, a 23-year-old graduate of engineering, writes in the letter to Rice that he and his colleagues are not security threats. The three were initially issued with entry visas to pursue their Fulbright scholarships after a months-long diplomatic tussle between the US and Israel. But the students' entry visas were suddenly canceled after US officials said they received new information suggesting they were security threats. "We do not understand why, and we do not understand what changed," Abu Shaban wrote Thursday on behalf of the students.