Lagos, Nigeria (CNN) Authorities in Nigeria evicted thousands of impoverished residents from a Lagos slum, leaving many homeless, residents and eyewitnesses told CNN.

Residents described scenes of panic and confusion Tuesday as hundreds of navy personnel pushed into Tarkwa Bay and neighboring island communities on the Lagos Lagoon, ordering them to leave within an hour.

Navy Cmdr. Thomas Otuji, a spokesman for the operation launched in December, said the planned demolition of buildings aims to tackle oil theft along pipelines that run through the coastal city.

Mohammed Zanna, a resident and paralegal, told CNN that the forces shot sporadically in the air as residents, who said they had no prior notice, scrambled to find their families and pack their belongings.

"Everyone was panicking and packing everything they could carry. The men were shooting in the air and shouting that people should leave," Zanna told CNN.

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