SALISBURY — Some area residents say they heard a strange humming sound similar to that from a freight train late Wednesday night, but local authorities say they don’t know what it was.

One Cameron Glen resident told a Post reporter that he and his wife heard the noise about 11 p.m. He said he didn’t report the noise to 911 for fear of tying up the lines.

He described the noise as a combination of a train and space shuttle blast. The only other sound he heard was the barking of neighborhood dogs, he said.

He posted about the noise on the NextDoor neighborhood app and others responded that they had heard a similar noise. He said the noise lasted about five minutes.

A resident of the Forest Glen subdivision also reported hearing the noise.

One resident said on the NextDoor site that he found a video of a similar sound on YouTube that discussed the High-Frequency Active Auroral Research Program (HAARP) a defunct program that dealt with low- and high-frequency sounds.

Officials with the Rowan County Sheriff’s Office, Rowan EMS Division and the 911 communications center all said no one reported hearing the noise.

Contact reporter Shavonne Walker at 704-797-4253.