After all, they were, by the government's account, a sleeper cell.

It's always easy to say afterward, This was a sleeper cell.

Both were alleged to be part of, or associated with, a terrorist sleeper cell.

The nature of sleeper cells - people apparently integrated into society - makes it hard to know.

The British experience this summer has lessons for us about finding terrorist sleeper cells.

The members of the sleeper cell are nothing like average human beings, although they appear indistinguishable to us.

The threat that was coming was not from sleeper cells.

Second,"sleeper cells" and "a variety of terrorist groups" had turned up at home.

Many developing nations would rather talk about development and trade than about sleeper cells.

Did anyone watch Sleeper Cell when it came on channel 4?