31.   No bombs were found, but the authorities blamed the Irish Republican Army for the threats.

32.   No bombs were found, but traffic in central London was snarled for hours.

33.   No bomb had been found.

34.   No bombs were found, but officials said the schools would not reopen until the source of the e-mail messages could be found.

35.   No bombs were found on either flight.

36.   No bombs were found, and government workers are expected to report for work today.

37.   Not only can the systems find bombs, including plastic explosives, but also they can pinpoint guns and knives, the company said.

38.   No bomb was found, and the ACLU is considering seeking an injuction that would bar police from entering the hall.

39.   No bombs were found, and patients were not evacuated, a hospital spokesman said.