Cops: Mom, tot die after 911 call from sinking car

View more videos at: http://nbcdfw.com. By Lita Beck and Scott Gordon, NBCDFW.com FORT WORTH, Texas -- A mother and her toddler died after becoming trapped inside a sinking vehicle that had crashed into a pond, police said. According to police, the force of a collision sent the car through a fence and into the pond at the Amelia Park Apartments in southeast Fort Worth. The driver called 911 as her vehicle was sinking and told the police operator that she couldn't open the doors to her car. Witnesses said the victims were underwater for about 30 minutes before divers were able to pull them from the vehicle. More news from NBCDFW.com The woman and her 22-month-old daughter were both pronounced dead at local hospitals. 'We really couldn't do much' Nathan Brown, who witnessed the crash, said the car "took off straight into the pond" after it was hit by another vehicle. Brown said he and his friend, John Piszor, jumped in to help. "The car was sinking, just slowly sinking, but it was sinking fast enough to where we couldn't really do much," Piszor said. Piszor said the car's doors were locked and they tried to break the windows. "There's only so much you can do when you're swimming," he said. The Fort Worth Fire Department said one of its crews and Forest Hill police that responded to crash were not able to free the victims. Divers from the Fort Worth Fire Department later arrived and pulled the child and mother from the car. The child was taken to Cook Children's Medical Center in critical condition, MedStar said. The mother, who was also in critical condition, was taken to John Peter Smith Hospital. Both were pronounced dead when they arrived at the hospitals.