发生了什么事？
现场浓烟呛人，警戒线已拉起。[{'character': '现', 'pinyin': 'xian4', 'highest pitch': 11.05, 'lowest pitch': 9.74, 'duration': 0.27, 'prosody hierarchy': 'null'}, {'character': '场', 'pinyin': 'chang3', 'highest pitch': 9.74, 'lowest pitch': 5.49, 'duration': 0.29, 'prosody hierarchy': '#2'}, {'character': '浓', 'pinyin': 'nong2', 'highest pitch': 9.45, 'lowest pitch': 5.49, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '烟', 'pinyin': 'ian1', 'highest pitch': 10.84, 'lowest pitch': 9.45, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '呛', 'pinyin': 'qiang4', 'highest pitch': 11.02, 'lowest pitch': 7.22, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '人', 'pinyin': 'ren2', 'highest pitch': 9.16, 'lowest pitch': 5.79, 'duration': 0.29, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.16}, {'character': '警', 'pinyin': 'jing3', 'highest pitch': 7.59, 'lowest pitch': 5.84, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '戒', 'pinyin': 'jie4', 'highest pitch': 10.51, 'lowest pitch': 6.1, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '线', 'pinyin': 'xian4', 'highest pitch': 11.05, 'lowest pitch': 6.88, 'duration': 0.23, 'prosody hierarchy': '#2'}, {'character': '已', 'pinyin': 'i3', 'highest pitch': 6.88, 'lowest pitch': 5.5, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '拉', 'pinyin': 'la1', 'highest pitch': 6.65, 'lowest pitch': 5.5, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '起', 'pinyin': 'qi3', 'highest pitch': 5.87, 'lowest pitch': 4.44, 'duration': 0.29, 'prosody hierarchy': '#4'}]