Ah he's dead now.
https://mainichi.jp/english/articles/20220708/p2g/00m/0na/061000c
Many details in this article.
> The weapon used by Abe's assailant made a noise that could be compared to an explosion and white smoke rose into the air after it was discharged. A gunpowder-like smell could be detected afterward. 
Was it a gun?