Pennsylvania UFO Caught on Camera

Residents outside Harrisburg, Pa., spotted a mysterious object in the sky.
2:31 | 08/28/14

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Transcript for Pennsylvania UFO Caught on Camera
? starships ? We want to get to this. A mysterious sight. They saw a strange object flying overhead and managed to catch it on tape and Brandi Hitt is here to explain. Still a big mystery this morning. Good morning. Residents in Harrisburg are still trying to figure out exactly what those flashing lights are. Aliens, a drone maybe? Well, even a local police department does not have an answer. Oh, I am scared to death now. Reporter: It's the video that is sparking rumors of extraterrestrial life all shot on Stephanie Wilkerson's cell phone. Oh, did you see that. Reporter: Wilkerson says she was relaxing on her porch Monday night when the unidentified flying object caught her eye. I thought it was a plane until I realized it wasn't moving and I watched it for about 20 minutes and I started noticing it changing colors. Reporter: That's when she ran for her phone and called over a neighbor. He went and got his binoculars because he first thought it was a planet and then he said, no, its changed yellow. That is not a planet. Reporter: So she called 911. Look at that. Look at that. Reporter: But even police were dumbfounded. He went there and apparently he saw them too so he called his sergeant and his corporal to come to verify what he was seeing. Reporter: So police called the National Guard training center and the local airports to find out if they could account for any aircraft activity in the area. They couldn't. This is unbelievable. Reporter: This isn't the first ufo sighting in recent weeks. In July, this questionable object was spotted as firefighters battle a wildfire in Canada and just two weeks ago these photos were posted all over Twitter convincing many that the illuminated round disk was something extraterrestrial while some just don't buy it. One photo suggesting it was a reflection of this lamppost. Back in Pennsylvania Wilkerson says she says these lights prove we are not alone. I'm now a believer in ufos. The whole neighborhood getting involved here. Listen to this. Stephanie says this is not a fluke, she saw the light again last night and frankly is now a little freaked out. Another neighbor also saw it last week. So any guesses? Well, it's definitely a ufo. It's an unidentified flying object. Some of the stuff -- I'm with her. I do think it's strange. No flight activity from the airport. Even the police sergeant is like, we have no idea. We'll stay on top of it.

This transcript has been automatically generated and may not be 100% accurate.

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