Small Diameter Bomb...
Most likely a rocket from a drone.
They don’t usually have a lot of explosive - probably between 10 and 20 pounds.
I knew what an SDB was, been working on systems to support accurate deployment of this for awhile. I had just never seen one in action. Designed to literally be dropped from high altitude where the plane/drone cant be seen or heard, and fly into the chimney of an apartment, devastate the inside of the apartment, and leave the neighbors undisturbed...well, more or less. :)
More likely an AGM-176 Griffin.. better accuracy.