An outbreak of violence has shocked New Orleans, with 17 people shot in an 18-hour period.
In all, 12 people were murdered in the first 12 days of the year. At least two dozen, including a 12-year-old girl, have been wounded.
Mayor Mitch Landrieu called the situation "a battle for the heart and soul of New Orleans".
The incidents included a gunman who opened fire inside a house yesterday, shooting five people, three of whom died. Police chased down three suspects and returned fire, killing one and wounding two.
Later that night, police headquarters were evacuated when two grenades were found in the boot of a car. They were both duds.
Police superintendent Ronal Serpas said the shootings involving police may have been sparked by more aggressive tactics against known criminals.