I'm afraid something urgent has come up.

恐怕有紧急事情发生了。

《牛津词典》

He asked to see the manager for something urgent.

他有急事求见经理。

《新英汉大辞典》

A: I've something urgent to tell you.

有急事要告诉你。

youdao

"Does the government not realise that unless we do something urgent then young people will be failed" he added.

BBC: Draft Budget Debate

He had something urgent to tell me, urgent!

WSJ: Ben Fountain on Haiti After the Earthquake | Traveler's Tale

You set up priorities around getting the work done now instead of putting it off because you know something urgent will cross your desk with an earlier deadline than anything you already have in the queue.

FORBES: Bridging Corporate and Startup Cultures