Two children and an adult died after a van rolled into a pond while the driver was away asking directions to a barbecue.
Another child was in critical condition.
The driver was outside the van when it started to roll down a hill to a pond about 70 yards (64 meters) away, Fire Battalion Chief Ismael Pomales said. People nearby tried unsuccessfully to stop the van, and fire personnel could not reach the people inside it.
A scuba team removed the victims about 20 to 25 minutes after they went into the pond.
The children appeared to be under 5, Pomales said. They and the adult have not yet been identified.
"It's horrible," Pomales said. "We've had children die before. That's probably one of the toughest things for any rescue person to deal with."
The driver, who was in apparent shock, was being questioned by police.
The behavior of the Russian inspector satellite, which was launched in the autumn of 2017, puzzles military officials in the United States
Ukrainian bloggers draw a parallel between the events in East Timor and the Crimea. Any comparison has a right to exist, but a detailed analysis of the situation does not give a promising forecast to Ukraine
Vladimir Putin is planning to attend the wedding ceremony of Austria's Foreign Minister Karin Kneissl on the way to Berlin