By Melissa Newton, CBS 11 News

DALLAS (CBSDFW.COM) – A Dallas mother and her children got quite a scare Wednesday morning, when thieves tried to steal their car with them still inside.

It happened just after 8:30 a.m. at the Holy Trinity Academy on Hillcrest in North Dallas.

“The thought of somebody doing that is beyond me,” explained the Dallas mother, who doesn’t want to be identified. “This is a safe area. It’s a really safe area.”

The woman was dropping her children off at school when the incident happened.

According to the police report, because of the rain, the woman left her car running and crawled into the backseat with her children to help them put on their coats.

Two women, in their mid-20’s, pulled a car up next to the family.

The victim told CBS 11 News that one of the women jumped into the victim’s car, threw it in reverse, and started backing out of the parking lot. “It happened so fast,” she said. “I immediately screamed and lunged toward her [the car thief], and it’s only at that point she realized somebody was in the vehicle.”

Once the suspect saw the mother and children in the backseat, she put the car back in park, got out without saying a word, jumped into the getaway car and fled.

“It just shows you how quick an offense can take place,” said Dallas Police Sr. Corp. Kevin Janse. “And it could have turned dangerous.”

Police are investigating the crime as an isolated incident. “It is a crime of opportunity,” Janse said of carjacking crimes. “It just shows you you’ve got to be aware of your surroundings.”

In the last year there has only been one other car theft in that area. In that incident, the victim was not in the car at the time.

The mother now hopes her story will serve as a warning to other parents. “I will never do it again,” she said. “I don’t care if they’re [her children] wet, I don’t care if they’re sweaty or cold. I will turn off the vehicle and we will all get out at the same time.”

Witnesses were able to get a license plate number on the getaway car, but police say the tag was reported stolen from another vehicle.