Wednesday's explosions took place on waste ground in the predominantly Shia area of Amil.
The area is a popular spot for evening games of football.
About an hour earlier, two mortar shells landed during a football match in the Abu Dshir area of the Iraqi capital, killing three people, said Firas Queti, an Iraqi police captain.
At least 24 people were killed in violence across Iraq on Wednesday.
Three people died and nine were wounded during explosions in Tayaran Square, in central Baghdad, an interior ministry official said.
Two civilians were killed and four injured when a roadside bomb exploded as their car passed the town of Hawija, near Kirkuk.
A traffic police colonel and a policeman were killed by gunmen near Baquba, north of Baghdad.
In the northern city of Mosul, a roadside bomb targeting a police patrol killed an officer and wounded three others.
Near the town of Tal Afar, three mortars landed in a village square, killing one civilian and wounding three others.
A total of 25 corpses were found in various places around the country, including 15 in Baghdad alone.