31.   Bacon and other officials declined to discuss the details of the effort, citing security concerns.

32.   Because of security concerns the UN has no American staff based in Afghanistan.

33.   Because of national security concerns, federal regulations give customs inspectors more leeway in conducting searches than police officers have, several legal experts said.

34.   Because of this security concern, negotiations have bumped along inconclusively, with a new round scheduled for Tuesday in Cairo.

35.   Bayer officials are loath to divulge even that number out of security concerns.

36.   Because of security concerns, the jurors hearing the case are anonymous.

37.   Because of security concerns, the White House did not say when the speech will start.

38.   Because of security concerns, they are no longer allowed to wander through the White House and Capitol anyway.

39.   Before that our government had already banned flights between the United States and Nigeria because of security concerns.

40.   Bin Laden also hoped the recruits would obtain travel visas in the United States that could be used by al Qaeda operatives to move between countries without security concerns.