Six fans were injured after metal poles holding up tentage at an AKB48 handshaking event collapsed.
Chiba Prefecture police reported that several pillars fell apart due to intense wind at the venue on Mar 10.
According to a report in NHK news, the injuries sustained by the victimes were relatively minor, including small cuts and bruises.
They were treated at a nearby hospital.
The collapse had reportedly happened before the arrival of the band.