Question: what event led to establishing the department of homeland security answers.com
[{'answer': 'the September 11 attacks', 'provenance': [{'wikipedia_id': '58236', 'title': 'United States Department of Homeland Security', 'start_paragraph_id': 11, 'start_character': 106, 'end_paragraph_id': 11, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::History.:Creation.\n'}]}, {'provenance': [{'wikipedia_id': '58236', 'title': 'United States Department of Homeland Security', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 490, 'bleu_score': 0.8231125499102581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9367016158927303420}, 'section': 'Section::::Abstract.'}]}]