(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.
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NEW: Four bombings kill at least 20 in Baghdad on Wednesday, 16 of them at wedding party
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10 also killed in Mosul, including activist shot to death, two killed by car bomb
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Three bodies, apparently tortured and hanged, recovered from Tigris River in Mosul
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More than 350 people killed in Iraq in May as Sunni-Shiite discord rises
Also, Iraqi federal police killed four people in clashes with unspecified gunmen in eastern @placeholder, police officials in the city said.