alarm **
alert
warning signal
alarum

The first warning signal came from Iraq in the early 1990's.

Nor did he give the order to sound warning signals as required by international law.

The parents talk about how they missed all the warning signals.

"But it does not give us a clear warning signal."

"When the decision was reached, all the warning signals were there."

Something has to be done about this and the last elections were a warning signal.

However, should not the repetition of all those calls be a warning signal to us?

In recent years, there has been no shortage of warning signals.

He will, however, set out the warning signals for his fellow athletes.

We have also proposed a special information system to be able to give earlier warning signals when certain players in the market demand increased attention.