That is sad news. I used to know someone in Belgorod long ago. Too many have already died, and this is likely to take a long time to stop.

My Condolences for their loss, Let us hope that the Ukraine will take far greater care in preserving Civilian life as Ukraine tries to end this awful war for good.

I have a very strong feeling that this is a false flag. This is not the first time Putin has killed his own citizens in order to make people feel fear and support him. This has already happened with the explosion of a appaetment buildings in 1999.
But even if this is true, I'm sure that Putin ordered the placement of rocket launchers and artillery next to civilian structures to make it difficult for Ukraine to destroy them without killing civilians, this will allow him to easily accept martial law in the country and call all men as soldiers (even me ). I think Putin has no other options but to force the population in Russia to fight against Ukraine. Now the propaganda will most likely say here "I told you, I told you that Ukraine wants to kill all Russians. You didn't listen to me, and now look at this, the civilians are dead. You must all stand up for the motherland!" or something like that.
That only my opinion.
And that really sad what all that happens... I know one artist from Mariupol, she had no choice but escape to Russia... I really hope what she will be not harmed or killed.