51.   This second test produced a positive reading for anthrax where no such reading had been found in the first test.

52.   Workers at the U.S. Federal Reserve continued going through hundreds of letters Monday to locate the source of a positive reading for anthrax last week.

53.   Workers at the Federal Reserve were still going through hundreds of letters Monday in an effort to locate the source of a positive reading for anthrax last week.

54.   Police said the army was called after officers examining the cargo hold with an electronic explosives scanner got a positive reading from some crates.