Police identify gunman in Washington DC shooting that left one dead and four injured

One victim is in a critical condition and three others have non life-threatening injuries, officials say.

An active threat requires immediate distance from the area and following law-enforcement instructions. Avoid the location until officials confirm it is safe.

This report is based on information from BBC US & Canada, monitored by Alert USA's verified emergency feed.

Area access is restricted, public-safety teams are in active response, and travel through the location should be avoided entirely until officials give the all-clear.

Recommended steps: follow official instructions for your zone; avoid the affected area; account for family members; monitor official channels for updates.

Alert USA is tracking this active public-safety threat and will update this report as verified information becomes available.

Verified by Alert USA • BBC US & CANADA