ST. PETERS, Mo. — A mother, bystanders and police officers went into a pond Thursday morning during the rescue of a 3-year-old inside an SUV that rolled into the water near The Reserve at the Mid Rivers Apartments.

In a Friday interview with First Alert 4, Austin Collins said he was dropping his children off at a bus stop when he saw the SUV roll into the pond. He said he called 911, entered the water and used a hammer someone handed him to break a window. Collins said he cleared glass from the opening before pulling the girl out, cutting his hand in the process.

The girl’s mother, Megan Kohlhaas, credited the quick response from Collins and the others who helped. Investigators had yet to announce why the SUV began to roll.

First Alert 4 reported that the vehicle rolled down an embankment around 7:40 a.m. Police said the mother was outside the SUV at a bus stop when it began moving with the child still inside.

The mother and three bystanders entered the water to help. The mother, child and four police officers were taken to a hospital as a precaution for possible hypothermia, according to firefighters cited in the report. Three bystanders were taken for treatment of cuts and bruises.

The account provides more detail than the first reports that two people had been rescued. It does not establish why the SUV began rolling, and no cause should be inferred from the mother’s location outside the vehicle.

The Globe-Sentinel has not independently established further medical outcomes. This story replaces the earlier preliminary rescue brief.