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My guess is that there was first a failure of the boiler, so that it didn't come on for a long enough time that the house temperature dropped well below freezing. Water in the radiators froze, and the expansion cracked them. (Were the chunks "blown out" of the radiator right by the radiators, or some distance away?) Then later the boiler came back on, so the steaming hot water ran out the holes and froze on the cold surfaces.
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