Even elementary school students discussed the possibility of an attack.

The mercenaries wouldn't leave them and risk the possibility of an attack from behind.

Both the police and the public are clearly jittery about the possibility of an attack.

The concern about the possibility of an attack was apparent on Monday.

"There was a concern about the possibility of an attack, but this went back to the early spring," said one official.

It looks to me as if they have not even considered the possibility of an attack on the base.

One participant put forward the possibility of a Chinese nuclear attack, and many thought this likely.

The Americans, he knew, had never projected the possibility of an attack that would not come over the water.

He did not even mention the possibility of an attack from China.

This means there is a strong possibility of a terrorist attack.