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Mr. Goh got angry when she told him the school could not refund all his money because he had been enrolled for nearly half of the program, she said. Ms. Cervellon said she did not know how much Mr. Goh had paid in tuition.

Police have said Mr. Goh was seeking a female administrator when he went to the campus Monday. When he was told she wasn’t there, they said, he began shooting in classrooms, killing six students and a receptionist and wounding three others.