When he saw the police arrive, he bolted down an alley.

他看见警察来了，便从小巷逃走了。

《牛津词典》

As they drive off, the police arrive.

随着他们驾车离开，警察也赶到了。

youdao

How quickly did the police arrive at the scene?

你猜猜警察多长时间到现场的？

youdao

Police officers arrive after getting reports of noises from the house.

VOA: special.2009.02.02

The teenager then said he would "shoot until the police arrive and then shoot himself".

BBC: Terror charges boy aged 16 pleads guilty

The problem is that by the time the police arrive, lots of people are already dead.

WSJ: David Kopel: Guns, Mental Illness and Newtown

The problems begin: the police arrive, break down the locked door to a bedroom and discover the lifeless body of one of her (Amanda's) friends.

BBC: Profile: Raffaele Sollecito