( CNN ) -- Double explosions of a roadside bomb and then a car bomb killed at least 10 people and wounded 40 others near a Shiite mosque north of Baghdad on Saturday , Tikrit police officials told CNN . Elsewhere in Iraq , at least five people were killed and 18 more wounded when a suicide car bombing hit near a security checkpoint at an outdoor market in central Tal-Afar , outside of Mosul , the city 's police and health officials said Saturday . Tal-Afar is mostly inhabited by Shiite Turkmen . In a third incident , three people were killed and six more wounded when gunmen attacked security checkpoints in southern Mosul , officials said . In the double explosions near the mosque , the blasts took place in central Tuz Khurmatu , located in Salaheddin province about 125 miles north of Baghdad . There is also a security checkpoint near the mosque as well as several shops , police said . It was the latest round of violence in Iraq . On Friday , at least 21 people were killed and dozens wounded in shootings and explosions across the country , officials say . The deadliest attack occurred in the neighborhood of Dora , southern Baghdad , where twin improvised explosive devices were detonated near an ice cream shop . Officials told CNN seven people -- including children -- died in the blasts and 18 others were wounded . Political unrest and sectarian violence between Sunnis and Shiites have festered in recent months . The U.N. Assistance Mission for Iraq estimates at least 979 Iraqis -- 852 of them civilians -- were killed in October alone . CNN 's Mohammed Tawfeeq contributed to this report .
NEW : At least five people are killed in a suicide car bombing in Tal-Afar . NEW : Three people are killed when gunmen attack a southern Mosul checkpoint . At least 10 people are killed when two bombs explode in Tuz Khurmatu . Bloodshed rises between Sunnis and Shiites .