Rina Kawaei, 19, and Anna Iriyama, 18, were meeting with fans in Takizawa yesterday when a man lunged forward with a saw and tried to attack them.
They sustained cuts on their hands and heads. A male staff member was also cut on his hand.
The group are very popular in Japan and other Asian countries.
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They are unique in that they hold the Guinness record for being the world's largest pop group. The group originally had 48 members, which were divided into 3 groups: A, K and B, hence the band's name.
But the current line-up now lists 140 members, with new members being voted in by the public every year.
No one was seriously injured and the police have arrested a 24-year-old man for the attack.
