yes you can add several images.
image=* + image:0=* + image:1=* etc
remark: the link that is created with StreetComplete will become unvalid after a while; via MapComplete you can create image links on imgur -> those links will remain valid.
for the wikipedia link: there was "incident" added to the tag. I didn't fint that in the wiki, that's why I removed the word 'incident'
https://www.openstreetmap.org/node/3915493161
https://www.openstreetmap.org/node/3915493161