CBS:

Police and Secret Service agents Friday were investigating a report of a suspicious substance found at former President Clinton's office in Manhattan.

Mr. Clinton was not at the office at the time, officials said. A woman opened an envelope that contained a white powdery substance and called authorities, according to news reports.

[..]"There is a search to try to recover some sort of foreign substance," he said, adding that Secret Service agents were also at the building.

Mr. Clinton's spokesman, Jay Carson, said the building at 55 W. 125th St. had not been evacuated. He had no other immediate comment. Read on...