Watch this: WA Nanny runs down porch pirate

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OLYMPIA, Wash. (CNN) -- A home surveillance camera catches a woman as she walks up to the front door of an Olympia, Washington, home, grabs a package, and runs to a getaway car that's slowly rolling past. But, that's when the story takes a surprising turn.

Just as the suspected thief tries to get into the SUV, the driver bolts and she falls back out - possibly because of the nanny running after her.

The nanny, Kate Anderson, was home at the time, watching over a one-year-old baby. She says a package arrived, and 10 minutes later, so did the thief.

"She was dressed nice. she had a dog in her jacket. This is just crazy," Anderson said.

Crazy didn't stop Kate. She says she saw the woman pick up the package from the front door and decided to run after her.

"I continued to run and like 'Hey, you not nice person! I see you, and you're stealing from me and when was on the ground I kind of kept her there," Anderson said.

Anderson said the woman tried to tell her she wasn't stealing.

"That's when she was literally like I was just checking your address, and I was like, 'No girl, I just saw you steal something,'" Anderson recounted.

Anderson marched the woman back to the home and held her there for eight minutes until police showed up and arrested her.

"If someone is doing something wrong, I'm not afraid to put them in check," Anderson said.

Tanya Smith, who owns the home, says she can see why the thieves went after her package.

"We're a house on the corner, it's a busy street, I understand why they would target out house," Smith said.

Smith's husband happened to install the ring camera just a few weeks ago, but never expected to catch criminals in the act.