A New York Police Department campaign to burnish its image via social media instead produced a flood of pictures of apparent police brutality and tweets critical of the force being shared at a rate of thousands an hour.

Police Commissioner Bill Bratton said on Wednesday he would continue and expand the NYPD Twitter campaign a day after it backfired, triggering an outpouring of negative images including police violence at New York's Occupy Wall Street demonstrations, an NYPD officer pointing a gun at a dog, and an officer asleep in a subway car.

"The reality of policing is that oftentimes our actions are lawful, but they look awful," Bratton told a news briefing at New York City Hall. "Most of those photos that I looked at are old news," said Bratton, appointed by Mayor Bill de Blasio to take over from Ray Kelly, who served for 12 years under de Blasio's predecessor, Michael Bloomberg.