People are telling you that sources that don’t have a track record of lying are typically good sources. Beyond that, you can use the FIRMS map for reviewing if an attack has really taken place. It’s a system for detecting forest fires by satellites, but it also detects any other bigger fires. You can use it for example to see where the actual front lines are because where a lot of artillery shells explode, there’s a “forest fire” on the map. It might not show everything because if there happen to be clouds overneath, the satellites will not recognise the fire. So, it might give you false negatives, but usually not false positives.