The worst accident occurde in,that 170 people killed when a passenger plane crashed on August 22.The worst accident occurde in,（）170 people killed when a passenger plane crashed on August 22.这个空应该添什么,
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Russia
8月22日,俄罗斯一架飞机在乌克兰东部地区坠毁,此次坠机事件共造成170人罹难.
======以下答案可供参考======
供参考答案1:
The worst accident occured in, （about）170 people killed when a passenger plane crashed on August 22.
最恐怖的意外发生了,8月22日 170名乘客在坠机事件中全部罹难。