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- The museum was reportedly unmanned since 5:30 p.m. on Sunday.
- Police were alerted after the alarm inside the museum’s office went off at around 1:30 a.m. but the thieves were already gone after the authorities arrived at the scene.
- The thieves managed to get away with a safe measuring 50 centimeters (19 inches) on all sides and weighed 150 kilograms (330 pounds).
- Authorities discovered the door of the office containing the safe was opened by a tool believed to be a crowbar.

- Investigators estimated it took the criminals about three minutes to pull off the heist.
- The safe contained at least one million Japanese yen ($9,430) in admission fees collected over the last weekend from around 1,100 people, the museum said.