A car driven by a 91-year-old man thought to have had a heart attack careened down a street at up to 80 mph, killing the motorist and three other people in a fiery pileup, police said.

Among those killed Tuesday were two children trapped in a burning car, authorities said. One person was critically injured.Police said the elderly man, who had a history of heart trouble, apparently was stricken at the wheel and jammed the accelerator to the floor.

The victims' identities were not immediately released.