Photo: Reuters
Updated 9.40am
Nevada police took a suspect into custody in downtown Reno after responding to reports of an active shooter, but there were no immediate reports of casualties.
The unidentified suspect was barricaded for a time inside the Montage apartment complex in the city, the Reno Gazette Journal newspaper said.
Shots were heard coming for 20 minutes, it added, citing the Nevada Highway Patrol.
According to some media reports, police say the gunman is dead.