A police car is seen at USA Today's headquarters in McLean, Virginia, the United States, on Aug. 7, 2019. USA Today's headquarters in McLean, Virginia was evacuated Wednesday following a probably mistaken police alert of a man with a weapon at the building in suburban Washington D.C., the newspaper said. (Photos: Xinhua)

A Police officer is seen at USA Today's headquarters in McLean, Virginia, the United States, on Aug. 7, 2019. USA Today's headquarters in McLean, Virginia was evacuated Wednesday following a probably mistaken police alert of a man with a weapon at the building in suburban Washington D.C., the newspaper said.

Police officers are seen at USA Today's headquarters in McLean, Virginia, the United States, on Aug. 7, 2019. USA Today's headquarters in McLean, Virginia was evacuated Wednesday following a probably mistaken police alert of a man with a weapon at the building in suburban Washington D.C., the newspaper said.

A police car is seen at USA Today's headquarters in McLean, Virginia, the United States, on Aug. 7, 2019. USA Today's headquarters in McLean, Virginia was evacuated Wednesday following a probably mistaken police alert of a man with a weapon at the building in suburban Washington D.C., the newspaper said.

A police car is seen at USA Today's headquarters in McLean, Virginia, the United States, on Aug. 7, 2019. USA Today's headquarters in McLean, Virginia was evacuated Wednesday following a probably mistaken police alert of a man with a weapon at the building in suburban Washington D.C., the newspaper said.

USA Today's headquarters is seen in McLean, Virginia, the United States, on Aug. 7, 2019. USA Today's headquarters in McLean, Virginia was evacuated Wednesday following a probably mistaken police alert of a man with a weapon at the building in suburban Washington D.C., the newspaper said.