NEW ORLEANS (CNN) -- Four New Orleans police officers have been suspended and one has been reassigned over allegations of looting in the chaos after Hurricane Katrina, acting Police Superintendent Warren Riley said.

The city's police department is investigating reports that at least 12 police officers may have gone on a looting spree in the days after the storm hit.

The probe began after police officials reviewed videos from news reports, Riley said.

"The investigation does show police officers with some items," Riley said, but some of the officers took essential items such as food and clothing, which they needed to carry out their jobs.

Meanwhile, Louisiana Attorney General Charles Foti Jr. acknowledged his office was investigating "two separate incidents of potential looting by law enforcement" but would not identify the jurisdictions involved.

The officers are alleged to have taken non-essential items like televisions or jewelry or to not have acted against looting.

Riley promised "swift and decisive action" against any violators, saying, "There is zero tolerance for misconduct or unprofessionalism by any member of this department."

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