Two small children have been rescued after they were found wandering alone and barely dressed in sub-zero temperatures.
A sharp-eyed bus driver spotted the "tiny little kids" and whisked them away to warmth and safety.
Nicole Chamberlain told FOX6 she had been driving her usual bus route through the streets of Wisconisn early on Monday morning, when she spotted the pair picking their way through the snow.
She said the boy was wearing just a T-Shirt and trousers, and the girl was wearing only a T-shirt and nappy.
No one had a coat on," the Waukesha Metro Transit bus driver told FOX6 on Tuesday. "It was snowing, and it was windy, and these were tiny little kids."
US media reports the boy, aged six, and the girl, aged two, had wandered away in temperatures of just 3 degrees Fahrenheit (-16C).
Surveillance video from inside the bus released by the Waukesha Police Department shows Chamberlain taking off her own coat and using it to warm up the children.
When asked what they were doing out there alone in the cold, the children replied they were "looking for Grandma."
The bus driver reassured the tiny pair she would help them find their grandmother as she phones for police.
"It's OK, honey — we're gonna figure it out," Chamberlain can be heard saying on the video. "You're nice and warm on the bus."
Chamberlain reportedly contacted the police, but the children's family came to the bus before officers arrived and they were reunited with the little boy and girl.
"I'm just thrilled I was in the right place and right time, but even more thrilled the situation turned out to be even better than what you hear sometimes," the bus driver told FOX6 .
She added: "They went back, they were with a happy family. They were safe. That was most important to me."
The Sun reports authorities were not recommending pressing charges.
A chill has enveloped the eastern two-thirds of the US and the Midwest, as freezing temperatures bring in autumn snow, causing lakes to ice over and below-freezing temperatures as far south as the Gulf states.
