Tell your people the next time you check in, and they can warn the Spanish authorities.

He warned authorities in the West to be aware of suspicious activities.

Well, I'd done my job and warned the authorities.

He and other security experts had often warned the authorities of the towers' vulnerability.

Our problem now was how to pass through Leh without being discovered by any one who might warn the authorities.

He tries to warn authorities on the train and flee with Christina.

Will it do any good to warn the authorities?

They attempt to warn the authorities but are ignored.

If things are as bad as you think I'd better warn the authorities.

"We warned authorities here to be on the lookout."