Police praised an 8-year-old boy for saving his 10-year-old sister from a kidnapper and carjacker in Middletown, Ohio.

The children were with their great-grandmother, 69-year-old Nita Coburn, who parked in front of the hospital entrance at Atrium Medical Center to help her sick daughter get inside.

Coburn told WCPO-TV she thought she had locked her car doors, but later realized that a safety feature of the vehicle prevented the car doors from locking while the keys were still inside.

As soon as Coburn disappeared through the hospital doors, she heard the terrified screams of her great-grandchildren, Skylar Weaver, 10, and her 8-year-old brother, Chance Blue.

Coburn raced outside to find a stranger driving away in her car with the kids still inside. She grabbed the driver’s side car door and tried to open it, but the man kept slamming it shut.

“I started hearing the kids screaming and I ran to them,” Coburn told WCPO. “All I could see was my great-grandbabies in the back seat. Every time I think about it, I want to cry.”

As Coburn was being dragged down the road, she saw that the driver was holding tightly to Skylar’s hooded sweatshirt.

Video surveillance showed the moment that Chance managed to open the rear door and tumble out, yanking his sister out of the kidnapper’s grasp and down onto the pavement with him.

Police caught up with the driver and arrested Dalvir Singh, 24, on charges of kidnapping, grand theft and felonious assault.

Coburn was rattled by the event, but grateful her two great-grandchildren were uninjured and safely back by her side.

“It’s the most morbid feeling in the world,” Coburn said. “No one needs to feel that fear.”

Police are praising Chance for his fast, level-headed thinking at such a young age.

“This little guy is a hero,” Police Chief Rodney Muterspaw told WXIX-TV. “No question. He pulled his sister out of the car with no concern for his own safety. That is incredible at his age.”

Middletown police officer Connor Kirby echoed the police chief’s words, calling Chance “extremely heroic.”

“It shows how extremely brave he was and how much he loves his sister,” Kirby said.

Chance spoke with “Good Morning America” about the scary situation, saying, “I was acting in the moment because I didn’t want my sister to get hurt.”