Beyond sonic a conclusive list of options could also include: attacks with gas form, liquid form, radioactive form, solid form - could be through the meals they ate, the booze they drank, a drug they took, a sea or other animal.

I'm curious if there are any links to independent explanations or investigations maybe from local sources? [1] this from another thread.

[1] https://www.justsecurity.org/44289/sonic-attacks-diplomats-c...