But were they civilians?
It does seem like an intentional attack on some people... Who were standing around cars doing something near some interesting, well secured facility with lots of black cars around.
So yeah, it's quite plausible it was FSB or some other not exactly civilian kind of civilians.
It's supposed to be around a border crossing - which is a kind of facility that Russia has also attacked since day 1 of the war:
The Ukrainian State Border Guard Service early Thursday said Russian troops attacked Ukraine from Belarus.“At about 5:00 a.m., the state border of Ukraine in the area with the Russian Federation an…
thehill.com