A man died after suffering critical injuries Thursday night during a townhouse fire in the Alexandria area of Fairfax County, fire officials said.

Firefighters arrived at the 8600 block of Venoy Court to find fire raging inside a second-floor bedroom about 9 p.m., said Deputy Chief Chuck Ryan, a county fire department spokesman. Several family members who escaped the burning home told firefighters a man remained inside.

As they battled flames, firefighters rescued a man from the burning bedroom. The victim was taken to a hospital with life-threatening injuries where he died, Ryan said.

Officials declined to describe his injuries or release his name.

The fire extended to the home’s attic and damaged two adjoining townhouses, Ryan said. The cause of the fire is under investigation.