"Known suspects" assaulted the woman after a minor car accident in a apartment complex on Friday, Dallas police said in a statement.
The suspects reportedly used homophobic insults during the assault and the police used it to determine whether this crime would qualify as a hate crime, the statement said. No information about the suspects was immediately available and no arrests had been made.
The officers were called to a Dallas hospital at 11:23 pm Friday after the victim was injured in the attack. Police said the incident was filmed.
Dallas Mayor Mike Rawlings said he had viewed the footage.
"I am extremely angry at what appears to be mass violence against this woman," said Rawlings. "Those who did this do not represent what Dallasians think about our flourishing LGBTQ community, we will not defend that kind of behavior."
"This must not happen to anyone else's child, so we pray for everything to be made legitimate.We know that the Lord is acting mysteriously," said Pierre Booker.