BINGHAMTON, N.Y. (AP) – Federal investigators are investigating threats to bomb the Democratic National Convention in Boston last month, which they say were mailed from upstate New York.

Agents have questioned a Los Angeles-area man, who has Binghamton relatives, according to an FBI application for a search warrant.

The man was questioned about mid-July threats of the detonation of biological and nuclear weapons at the Democratic convention, according The Press and Sun-Bulletin of Binghamton. The newspaper did not name the suspect because no charges have been filed.

The warrant says the man said he knew of seven suitcase nuclear devices somewhere in the country.

The warrant application filed in Seattle says that two threatening letters were postmarked in Binghamton on July 15 and received at the local FBI office the next day. Both were signed “Patriot.”

A third letter, mailed July 17 to the Binghamton FBI office from Johnson City, referred to chemical weapons allegedly located in Washington state and Peabody, Mass. That letter was also signed “Patriot.”

Investigators did not report the discovery of any bombs at the convention, but agents said the person who wrote the letter can be charged for using mail to threaten to kill or injure people.

AP-ES-08-08-04 0021EDT