Police have arrested a 25-year-old woman who threatened on Twitter to release sarin at a station in Chiba Prefecture and called herself the Reiwa Era version of Shoko Asahara, who was the mastermind behind the 1995 sarin attack on the Tokyo subway system.

Miyuki Yamamoto, who ran unsuccessfully for the Funabashi Municipal Assembly in Chiba Prefecture last month, was arrested Monday on suspicion of obstructing business with fraudulent information.

¡°Today at exactly 1 p.m., I will spread sarin inside Funabashi Station. I am the Shoko Asahara of the Reiwa Era,¡± Yamamoto posted on Sunday morning. The post has since been taken down.

Asahara was also the founder of the doomsday cult Aum Shinrikyo.

Yamamoto has admitted to the charges. ¡°There is no doubt that I have interfered with police operations by making criminal threats,¡± she was quoted as saying by investigators.

Masaya Hamada, deputy chief at Funabashi Police Station, said that the police were first notified of the threat 10 minutes after the post was published on Twitter, receiving reports from people who saw the post.

The police subsequently searched the station and the area nearby but didn¡¯t find anything suspicious. Investigators are still trying to figure out the motive behind the threat.

Following the arrest, Yamamoto also made several Twitter posts claiming that she is ¡°useless¡± and will ¡°spend her life in prison.¡± Some people expressed concern in response to her tweets, saying that she could have a mental illness.

The police are currently investigating whether she actually made sarin at home in the wake of recent attacks on political leaders. The latest one was an attack on Prime Minister Fumio Kishida last month with what is thought to have been a homemade bomb while Kishida was stumping for an election candidate.

Yamamoto ran unsuccessfully in the Funabashi assembly election on April 23, garnering only 316 votes.