Video images from the scene showed rubble in a Fort Worth street between two buildings and first responders on the scene.

Out of those injured, one person was critical, two were serious and the rest were minor injuries, according to Fort Worth MedStar.

"We are currently working a Major Incident. Please avoid the downtown area," the Fort Worth Police Department said on messaging platform X, adding more information will be given later.

Officials offered no details of the cause of the blast but said a family reunification area had been established in the Sundance Square pedestrian district.

(Reporting by Kanishka Singh and Dan Whitcomb; editing by Jonathan Oatis and Chris Reese)

By Kanishka Singh