VIDEO: News conference on Navy Yard shooting

Investigators found no evidence of a shooting after a key Navy site in the U.S. capital went on lockdown Thursday because someone reported shots fired in the same building where a gunman killed 12 workers in a rampage two years ago.

Police said in a statement that someone had called from inside a Washington Navy Yard building, located less than 2 miles from the Capitol, to report possible sounds of gun shots around 7:30 a.m.

However, investigators found no sign of a shooting, and no one was hurt. No arrests have been made and no weapons were found, officials said.