Later that month, some time after delivering his letter, he was involuntarily committed to a mental hospital for two weeks, before being released in March after doctors deemed that he was not a threat.
Later that month after his letter was brought to the attention of Sagamihara's authorities, he was in fact arrested, detained, questioned, and then involuntarily committed to a mental hospital for two weeks. However, he was released on March 2 after doctors deemed that he was not a threat.