Final answer:
Phrases indicating a firestorm caused by bombing were identified from the primary source provided.
Explanation:
Identifying Phrases Suggesting Firestorm Resulting From Bombing:
1. '...causing a firestorm that killed anywhere from 25,000 to 100,000 people.'
2. 'Incendiary bombs are those that use fire and the spread of fire to inflict heavy damage.'
3. 'A quarter of the city had disappeared in ashes.'
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