HOW is it made?

A few scenes from The pianist
1) After the nazis throw the old man on a wheelchair over the balcony and shoot the remaining family members their jeep runs over the dead bodies.
2) The tank blows the hospital building.
They made it look very realistic, I couldn't tell how it's made, is it added in post-production process or there's some shooting technique to it?
Edit: Is this topic belong in Filmmaking misc section? I posted without noticing. Please move this thread to right section if appropriate.
 
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