The cause of the fire remained unknown, but a witness said he saw construction materials burning before the fire climbed up the scaffolding and quickly spread.
大火原因尚未查明，但是有目击者称，大火先在脚手架上着火，然后迅速蔓延直至大楼建筑材料起火。
The cause of the fire is still unknown.
飞机失火原因目前仍未所知。
The cause of the fire was unknown, and it was not clear how many of the injured were children.
火灾原因不明，也不清楚伤者当中有多少是儿童。
So far, no casualties have been reported in the inferno, which broke out at 8pm local time on Tuesday night. The cause of the fire is unknown.
目前这场大火造成的伤亡人数还没有被报道。火灾发生在当地时间周二晚间，起火原因未知。
All 157 passengers and eight crew members scrambled to safety before the plane was engulfed in flames. The cause of the fire is still unknown.
所有157名乘客和八名机组人员在飞机着火之前冲到安全处，飞机着火的原因依然未知。
The cause of the fire in unknown.
这场火灾的起因还不知道。
The cause of the fire in unknown.
这场火灾的起因还不知道。
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