Still, it is not yet known who is behind the attacks.
然而，到目前为止，还不清楚谁指使了这两起袭击。
Police say they are still investigating who is behind the attacks.
警方说，他们还在调查是谁策划了这些袭击。
We may never know the real story behind both of these attacks.
我们也许永远不会知道这两次攻击背后真实的故事。
We may never know the real story behind both of these attacks.
我们也许永远不会知道这两次攻击背后真实的故事。
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