Tokyo police on Wednesday arrested Wang Jialu, a 22-year-old student, and Li Suihan, 28, his alleged accomplice, on a charge of obstructing university operations. Wang allegedly enlisted Li, his former tutor, to assist in the plot in exchange for compensation. Wang, who sat the entrance exam held on Jan. 31 for international applicants, and Li are suspected of conspiring to photograph a math exam sheet while the testing session was ongoing, the Metropolitan Police Department said. Investigators said Thursday that Wang allegedly used small earphones during the exam to contact Li, who was outside the venue. Police are investigating under the assumption that the pair arranged to use devices that would go unnoticed by those around them.