( CNN ) -- Violence rocked two major Iraqi cities Wednesday , including Baghdad , where a car bombing near a wedding party and two other bombings killed at least 20 people , police said . In Mosul , a Sunni activist known to demonstrate against Iraq 's Shiite-led government was assassinated , one of 10 people killed or found dead from acts of violence Wednesday in the northern Iraqi city , Mosul police officials said . The slayings come amid an uptick of political and sectarian violence across Iraq , where more than 350 people died in acts of violence in May , according to a CNN tally . And Wednesday 's attacks come on what is becoming an especially deadly week in the country -- at least 110 people have been killed since Monday . In Baghdad , two car bombs and a roadside bomb exploded in separate Sunni neighborhoods in Baghdad within 30 minutes of each other Wednesday evening , police in the Iraqi capital said . One of the car bombs detonated near a wedding party in al-Diwan , a neighborhood in southwestern Baghdad , killing at least 16 people and wounding 42 others , according to police . It was n't clear whether the wedding party involved Sunnis or Shiites . The other car bomb exploded in a market in the al-Gazaliya neighborhood in western Baghdad , killing four people and wounding 17 others , police said . And in the al-Khadraa neighborhood in western Baghdad , a roadside bomb wounded six people , police said . Meanwhile , Wednesday 's killings in Mosul -- about 430 kilometers ( 265 miles ) north of Baghdad -- were another sign of a shaky security situation in Nineveh , the province where Mosul is located and one of three Iraqi provinces that postponed April 's provincial council elections until July because of violence . Gunmen fatally shot Sunni activist Sheikh Hassan al-Jabouri with pistols equipped with silencers in central Mosul , a predominantly Sunni city , police said . No suspects have been announced . Al-Jabouri was active in demonstrations demanding that the Shiite-led government stop what protesters call second-class treatment of Iraq 's Sunni community . Since December , tens of thousands of such demonstrators have taken to the streets across Iraq . Sunni Arabs had more political clout in Iraq during Saddam Hussein 's rule , until his government was deposed in 2003 after the U.S.-led invasion . Under the Shiite-led government in the post-Saddam era , Sunnis have felt marginalized . About two-thirds of Iraq 's nearly 32 million people are Shiite and roughly a third are Sunni , according to the CIA World Factbook . Also Wednesday , a suicide attacker detonated a car bomb at a police station in southern Mosul , killing two people and wounding seven others , police said . And the bodies of three people who appeared to have been tortured and hanged were recovered from the Tigris River and sent to the Mosul morgue , police said . The hanging victims appeared to have died Wednesday morning , police said . They have not been identified . Also , Iraqi federal police killed four people in clashes with unspecified gunmen in eastern Mosul , police officials in the city said . The clashes happened after people reported suspicious activity in a building . When police arrived , gunmen emerged and attacked them , the Mosul police officials said . In other violence Wednesday , mortar rounds landed on offices of the Nineveh provincial council in central Mosul , wounding six people , according to police . Wednesday 's bloodshed comes amid an increase of violence across Iraq , much of it stemming from discord between Sunni and Shiite Muslims . On Tuesday , at least 23 people were killed and more than 80 others were wounded in three explosions and three shooting incidents in Baghdad and Mosul , police officials said . On Monday , at least 57 people were killed and 190 wounded in a wave of attacks in Baghdad and other cities , police said . READ MORE : Iraq at crossroads as bombs explode . READ MORE : April the deadliest month in Iraq in 5 years .
NEW : Four bombings kill at least 20 in Baghdad on Wednesday , 16 of them at wedding party . 10 also killed in Mosul , including activist shot to death , two killed by car bomb . Three bodies , apparently tortured and hanged , recovered from Tigris River in Mosul . More than 350 people killed in Iraq in May as Sunni-Shiite discord rises .