Tensions rose after the Dec. 18 withdrawal of US troops when Prime Minister Nuri Al-Maliki sought the arrest of the vice president on charges he ran death squads and also asked parliament to fire the deputy prime minister.
The December toll of civilians killed in bombings and other attacks was 90, down from 112 in November, according to figures from the Health Ministry.
Thirty-six police and 29 soldiers were also killed in December, figures from the Interior and Defense Ministries showed, compared with 42 police and 33 soldiers killed in November.
The figures also showed that 99 civilians, 92 policemen and 88 soldiers were wounded in violent incidents last month.
Bombings and killings remain a daily occurrence in Iraq nearly nine years after the US-led invasion, and its army and police, which assumed full responsibility for security after the withdrawal of US troops, are often targets.
The worst attacks occurred on Dec. 22 when a series of explosions in mainly Shiite areas across Baghdad killed at least 72 people.
The previous lowest monthly toll of 2011 was in May, when 102 civilians were killed.
