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It is hard in Hebrew to find an exact term without a little re-phrasing.
I think that something along the lines of:
פוצצו/פיגעו/מוטטו/החריבו שני מבנים תוך שעה אחת, וגרמו לקריסתם פנימה.
Also what Ron has suggested פוצצו ומוטטו פנימה is another great suggestion in my opinion.