It was on the replacement bus 26M for the Saltsjöbanan that the incident occurred on January 15.
The incident is believed to be rooted in a Tiktok challenge, according to Jan Landström, deputy security manager in Nacka municipality.
Mitt i has looked at all 365 incidents on buses and trains between Tattby and Fisksätra that have been reported to SL's security centre. It then appears that seven fireworks have previously been set off on buses and trains between Tattby and Fisksätra, since 2021.
Several of the cases have not been reported by SL either to the police or to Nacka municipality.