In case of emergency just call the police for help.

遇到紧急情况时，打电话向警察求助。

youdao

Yet he did not call the police for help, relying instead on two discreet aides.

但是他没有报警求助，而是依靠两个行事谨慎的助手[来决定自己应该如何反应]。

youdao

There's no help for it. We shall have to call the police.

没法子了。我们只得叫警察了。

《牛津词典》

Mr. MacMillan, the transit police chief, said he doesn't believe Mr. Donohue knew his friend had been shot when he responded to a call for help from Cambridge and MIT police, then joined in a pursuit of the suspects.

WSJ: Shot Officer Critical but Stable

The case was so frustrating for police and the family, because there were no real leads, that police went so far as to call on a psychic for help.

FORBES: Halloween Murder of Trick-or-Treater Still Unsolved 17 Years Later