Authorities say a 14-year-old girl was behind the wheel of an SUV that plunged into the shrimp basin, killing her mother, siblings and a man.
Authorities said Friday the girl was the sole survivor of the accident and was released from a Brownsville hospital shortly after being rescued from the water Thursday.
Port of Brownsville Police Chief Carlos Garcia said the victims are Juan Pablo Morales, 56; Juana Edith Alvarez, 29; Jesse Alvarez, 10; Emily Espino, 7; and Joe Alvarez, 4, all of Brownsville.
The name of the teen daughter is not being released.
Autopsies have been ordered, but the victims most likely drowned, authorities said.
A dive team and first responders worked for two hours to remove the submerged vehicle with two cranes from behind Zimco Marine. The bodies were found in the cargo area of the SUV.
Cameron County Sheriff authorities are conducting a criminal probe until they can determine otherwise, Garcia said, adding that any time people die authorities consider it a criminal investigation until the facts become clear.
(The Associated Press contributed to this report.)