WASHINGTON—U.S. Capitol police are investigating the discovery of at least two suspicious packages in Senate office buildings and "the individual who delivered them is being questioned," Sergeant at Arms Terence Gainer said on Wednesday.

Gainer said in an email the packages were delivered to at least two Senate offices.


It was not clear whether there was a connection between the letter and the envelopes.

Other officials said one of the packages had been discovered in the Russell Building, and the second in the Hart office building.