NEW ORLEANS — In a verdict that brought a decisive close to a case that has haunted this city since most of it lay underwater nearly six years ago, five current and former New Orleans police officers were found guilty on all counts by a federal jury on Friday for shooting six citizens, two of whom died, and orchestrating a wide-ranging cover-up in the hours, weeks and years that followed.

The defendants were convicted on 25 counts, including federal civil rights violations in connection with the two deaths, for the violence and deception that began on the Danziger Bridge in eastern New Orleans on Sept. 4, 2005, just days after Hurricane Katrina hit and the levees failed.

“The officers convicted today abused their power and violated the public’s trust during the aftermath of Hurricane Katrina, exacerbating one of the most devastating times for the people of New Orleans,” Attorney General Eric H. Holder Jr. said. “I am hopeful today’s verdict brings justice for the victims and their family members, helps to heal the community and contributes to the restoration of public trust in the New Orleans Police Department.”

In a grisly account, prosecutors said four of the defendants — Sgt. Kenneth Bowen, Sgt. Robert Gisevius, Officer Anthony Villavaso and former Officer Robert Faulcon — had raced to the bridge in a Budget rental truck that morning, responding to a distress call from another officer.