I suspect that an accident has happened.

我猜想是发生了事故。

youdao

A panda in a zoo in Wuhan has killed a Blue Peafowl, a large and brightly colored bird. This is the first time for several years such an accident has happened, Changjiang Daily reported.

据《长江日报》报道，近日，武汉动物园一只大熊猫咬死了一只蓝孔雀，这是近年来首次出现的意外情况。

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The army has not yet proffered an explanation of how and why the accident happened.

军队还没有提供对该事故如何发生以及为什么发生的解释。

《柯林斯英汉双解大词典》

The trust has said that whatever happened, several essential services had to remain local to the area, including an accident and emergency department, emergency surgery and maternity and children's care.

BBC: Plans for Wye Valley NHS Trust 'very worrying'