People gather at the scene of a car bomb in Baghdad's Habibiyah area, Iraq, May 27, 2013.
The United Nations says a wave of violence in Iraq left more than 1000 people dead in the month of May.
A total of 1,045 people were killed and 2,397 injured in the incidents of violence across the Arab country over the course of May, the UN said Saturday.
According to Iraqi police, at least four people were killed and more than 17 others wounded in a bomb explosion near a mosque in the Iraqi capital, Baghdad, on May 31.
Meanwhile, three policemen were killed and two others were injured after gunmen attacked a security checkpoint in the city of Fallujah.
The deadly attacks came a day after a series of bombings across Baghdad claimed 25 lives.
On May 30, the UN envoy to Iraq Martin Kobler warned that “systemic violence is ready to explode at any moment.”
He also urged Iraq's political leaders to “engage immediately to pull the country out of this mayhem.”
On May 28, Iraqi Prime Minister Nouri al-Maliki vowed to hunt down all the terrorists linked to the recent deadly violence, saying that the motive behind the bloodshed was to return the country to the “dark days” of the past decade.
Thousands of Iraqis, including Shia and Sunni Muslims, also staged unity prayers across the nation on May 24 to show their solidarity in the face of attempts to drag the country into sectarian strife.