I did some minimal searching for Seattle and explosions in 2020 and I found plenty of sources reporting on different supposed explosions, at different times and places (within Seattle). Seems perfectly plausible to me.

https://mynorthwest.com/local/peaceful-protests-planned-in-s...

https://projects.seattletimes.com/2020/local/protest-timelin...

https://spdblotter.seattle.gov/2020/09/24/police-arrest-13-d... https://spdblotter.seattle.gov/2020/07/26/officer-injuries-p...

https://www.thestranger.com/slog/2020/07/28/44178586/so-what...