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某市某歌舞厅由王某个人承包,经该市某区公安分局核准定员140人。歌舞厅在重新装修时,使用了大量的易燃装饰材料,装修完毕后没有向文化、公安消防部门申请验收便开始营业。此后虽经文化、公安消防部门检查督促,经营者仍未整改,消除隐患。某日13时20分左右,该歌舞厅3号雅间内,吴某给李某等人散发香烟,李某坐在转角沙发顶部,用卷着的报纸燃火点烟,随手将未熄灭的报纸扔进所坐沙发的破损洞里,致使沙发起火。李某和陈某把起火沙发两侧的沙发拉出,又跑到吧台拿来汽水灭火,用脚踩火,未能扑灭。进而火势蔓延,火焰蹿出了3号雅间,将歌舞厅墙壁悬挂的装饰布点燃,火势迅速扩大。由于南安全门上栓挂锁,无法出逃,人们一起拥到北门(只有0.8m宽)逃生,由于门窄拥挤且有5级台阶,挤倒成堆。在舞厅的304人中(包括工作人员5名),只有71人逃生成功,其余233人不同程度地一氧化碳中毒。事故造成4人重伤,16人轻伤,直接经济损失128万元。
根据以上场景,请根据本案例的描述分析导致本次事故发生及后果严重的原因。

【参考答案】

(1)直接原因
①李某在3号雅间点烟时,用卷着的报纸燃火点烟,又随手将未熄灭的报纸扔进所坐沙发的破损洞里,致使沙......

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