fałszywy alarm

But the study could turn out to be a false alarm.

It was probably just a false alarm, she told herself.

In fact, it was nothing more than a false alarm.

But what if it turned out to be a false alarm?

But you've got a lot to answer to me for if this is a false alarm.

But a few days later, he reported that it had been a false alarm.

No car was behind; that had been a false alarm.

The weeks since her false alarm have been especially tough.

He wasn't sure at all that it had been a false alarm.

Then, if it was a false alarm, no one would be any the worse.