A neighbor of a friend is suspected of killing two outdoor cats of 2 neighbors because his grandson is allergic. What should the owners do?

Plz call a animal control and 911 first thing tom to make a report, if done this is a serious offence

Call the police immediately. Save the cats remains for the investigation if needed. Speak to the police ASAP.

Definitely. The authorities must look into this and prosecute if found guilty.

They should call the police.