He also called to the men who had been fired upon at the north end.

They may return fire only if fired upon, which so far has happened just once.

"Do not take another step or you will be fired upon."

The major said his troops would fire on the population only if fired upon.

This morning of the second day our men, going for water, were fired upon.

No matter how many times it had happened to her over the last few years, she'd never gotten used to being fired upon.

They were then fired upon for over 15 minutes by the police from their four positions.

Don't fire unless fired upon, but if they mean to have a war, let it begin here!

They went way beyond "do not fire unless fired upon."

Reports also suggested the troops may have been fired upon.