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总结
美国加利福尼亚州洛杉矶县北部卡斯泰克（Castaic）发生天然气管线破裂并伴随爆燃，导致州际5号公路（I-5）一度双向关闭，正值假日出行高峰引发交通严重受阻。事发后相关部门封闭路段、处置泄漏并开展安全评估，附近居民被要求就地避险数小时以防吸入或爆炸风险。南加州天然气公司表示在控制风险后公路已重新开放，但事故具体原因仍在调查中。
正文
Gas leak outside Los Angeles shuts down major highway, nearby residents shelter in place for hours ABC News Crews try to determine the cause of explosive gas line rupture in Castaic that closed the I-5 Los Angeles Times 5 Freeway in Castaic reopens following natural gas leak; investigation into cause continues, SoCalGas says ABC7 Los Angeles Gas line explosion shuts down 5 Freeway in Castaic KTLA Holiday traffic hell as Interstate 5 shut down for hours in Castaic SFGATE
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