Some of the officers arrested had less than eight years on the city's 1,600-member police force.
The remaining officers were arrested by the military police at 18:00.
Robert Douglas killed his wife before officers shot and arrested him.
The ship's captain and first officer have both been arrested.
All together, 29 officers have been arrested in the scandal since March.
The officer had been arrested just after lunch; most of his working day lay before him.
They said the officer had been arrested and suspended without pay after an investigation.
The evidence she provided eventually led to nine Iraqi officers being arrested.
A number of the officers arrested were executed almost immediately.
In late September 2011, the officers involved were arrested on murder charges.