A 33-year-old man was arrested near the Mall in connection with numerous bomb threats against federal and District office buildings this month, D.C. police reported yesterday. No bombs were found.

Police said Paul Louis Waltz, who has no fixed address, was arrested about 11 p.m. Wednesday at 14th Street and Constitution Avenue NW after police received a tip. On Tuesday, before receiving the tip, police applied for an arrest warrant for Waltz based on an analysis of letters received by news media announcing that a bomb had been planted at the locations, officials said.

Inspector David Faison of the D.C. police Intelligence Division -- whose unit handled the investigation with the U.S. Bureau of Alcohol, Tobacco and Firearms and the FBI -- said Waltz was charged with making bomb threats in a series of calls and letters.

ATF spokesman Jack Killorin said the warrant charges Waltz with being responsible for two bomb threats to the Department of Housing and Urban Development this month. "We believe he is responsible for . . . other threats on Dec 4 and Dec. 16," he said.

On Dec. 4, a series of bomb threats led to the evacuation of thousands from about 20 buildings.

Waltz was arraigned in U.S. District Court yesterday and ordered to undergo a two-month psychiatric evaluation at St. Elizabeths Hospital.