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Mayor Eric Garcetti announced Tuesday that the city would purchase 7,000 body cameras for police officers in an effort to increase transparency.

Body cameras for officers have become a major issue in the wake of the shooting of unarmed black 18-year-old Michael Brown by a Ferguson, Mo., police officer and the conflicting accounts of what happened.

At a news conference, Garcetti said the cameras "are not a panacea, but they are a critical part of the formula. They're a great step forward."

"The trust between a community and its police department can be eroded in a single moment," Garcetti said. "Trust is built on transparency."

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