Since they are outside their jurisdiction (in another state), are they considered cops, or just thugs with guns? If the latter, and they are illegally on your property while armed, or firing at you while you are defending yourself from a mob, may they be engaged like any other armed assailant?
As they were in another state, they were just thugs with guns.
They wouldn’t even been able to enforce felonies.
No more than ANY private citizen can by effecting as “citizens arrest”.
Which, btw, only counts if you can keep the arrestee “arrested”.