An investigation into employment practices at the Myron B. Thompson Academy took a dramatic turn Monday when the state attorney general seized computers and more than 50 boxes of documents from the public charter school.

The search warrant executed at the online school’s offices at the Richards Street YWCA is part of a criminal probe by the Department of the Attorney General into possible theft of state funds, including paying staff for hours that they did not work. Charter schools use public funds and offer a free education but report to their own governing boards rather than the Board of Education.

Principal Diana Oshiro and the co-chairmen of the academy’s governing board, Myron K. Thompson and Malia Chow, did not respond to several requests for comment. An administrative report on the school issued in February by the attorney general highlighted questionable practices and made recommendations but did not lead to any charges.