Four car bombs killed at least 25 people in Shi'ite Muslim districts of Baghdad, according to Reuters.

The violent acts have not been linked to a specific group, but authorities believe they occurred in protest of Prime Minister Nuri al-Maliki by al Qaeda-linked Sunni Muslim militants.

An additional 76 people were injured during the four incidents as well, which took place while a number of people were out in the streets celebrating a public holiday to mark the birthday of Prophet Mohammad, according to Reuters.

"There should be political cohesion, social cohesion and political dialogue, inclusive dialogue," said Secretary-General Ban Ki-moon, who was visiting the Iraq capital this week.

Three policemen were killed when gunmen attacked a checkpoint in southern Baghdad, and four others were injured.

Last year 9,000 people were killed in Iraq, its highest total since 2008, according to research conducted by the U.N.

Medics from a local hospital confirmed the death count for all four incidents.

"The situation in Anbar Governorate, particularly in Fallujah and Ramadi, is a source of grave concern. The security situation in Iraq is undoubtedly a source of great concern," said the secretary general to reporters this week, according to the Associated Press.

The most recent crisis started back in December when security in Iraq stopped a Sunni protest camp located near Ramadi.

They also recently arrested an outspoken Sunni lawmaker during a bloody raid, according to AP.

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