51.   Investigators were checking radioactive laboratory materials Tuesday seeking the source of an isotope that may have been added deliberately to a water cooler at the National Institutes of Health.

52.   Investigators were checking the plane where it sat stranded on the runway.

53.   Investigators were checking whether she was also sexually molested, he added.

54.   Jankneckt added that the papers apparently had to do with tax information unrelated to Vulkan AG case, but investigators were still checking.

55.   Last week, Secretary of State Madeleine Albright told Congress that investigators were checking whether supercomputers sold to private Chinese companies may have been used for nuclear weapons testing.

56.   Published reports have said European and U.S. investigators were checking stock movements of three big European reinsurance companies.

57.   The bank said investigators should check the sources of the payments.

58.   The bill would enable investigators to check assets, bank accounts, financial transactions and safe-deposit boxes of suspects.

59.   The names of other foreign nationals as well as Americans were found in the same place in Afghanistan and all were being checked by investigators, Perry said.

60.   The plane was given a routine maintenance check Sunday night, and investigators were checking who had access to the plane during those hours.