Police search Capitol Hill buildings after 911 call about shooter, determine call was false alarm

An anonymous 911 call about an active shooter prompted a lockdown and evacuation of Senate office buildings.
Police conducted an extensive search but found no evidence of a shooter or gunshots.
Authorities now believe the 911 call reporting an active shooter was likely a hoax.
The Capitol Police are continuing to investigate the source of the bogus 911 call.
The scare occurred amid heightened security around the expected arraignment of former President Donald Trump.