Swat teams nearly always have grenades on them!
It wouldn't take a genius to strap a grenade to a robot with a string attached and then pull the pin when the robot was close enough to the target.
plus police use explosives to blow up suspected bombs all the time.
why are so many shocked that the police have access to explosives?
I know someone in Texas who is planning to use an R/C truck and two gallons of Tannerite to do the same thing to a beachball-sized hornet nest. I’ll post a video link, if all goes well. :-)