RIVER RIDGE, La. — Something mysterious is going on in Harahan and River Ridge. People there say they've heard strange cannon-like sounds, and they have no idea what's causing them.

"It's a very peaceful neighborhood," said Carol, a resident who did not provide Eyewitness News her last name. "It's very family oriented, quiet, so if we hear something, it's out of character."

"Definitely within the last four days I've heard something," said Crystal Roddy, another resident.

Questions are being asked in regards to a strange noise, that's shaking the nerves of many.

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"Sometimes it wakes up my kids," said Roddy. "It's usually between 8:30 and 10pm. All of a sudden it sounds like a boom, like something is dropping and something big landed on the ground."

"They sound like thunder sometimes, but sometimes they sould like fireworks, then other times it's hard to distinguish if it's a firework or a gunshot," said Carol.

People who've heard these loud 'booms' say they're happening more often. It's also happening in other parts of town, like in Lakeview. In 2017 though, some in Mid-City told us they experienced something similar.

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"It sounded like a bomb went off underneath our house, it rattled the whole house," said a resident.

"It was the loudest sound I can think of without an actual explosion going off," said another.

Comments have blown up on social media, one user even posting surveillance video, that is thought to have captured it from Waggaman. But what is it? People have their own theories.

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"There's a lot of noise on the river," one resident said. "The river is high, ships are riding high so you're going to hear something."

Others though say while logical, they don't think that's it. They are curious though, and wonder, if whatever's behind it will be found.

"When you hear it, you know you've heard it," said Carol. "It's loud and it's distinct. Just not easy to define what it is and where it's coming from."

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"I've kinda just gotten used to it, but I want to know what it is, and I don't know what it is," said Roddy.