The explosions targeted the "Race of Hope" annual marathon in Buea, in the Southwest region, 70 kilometres (43 miles) west of the country's economic capital Douala.
At least three people killed and scores wounded, with more casualties expected after two blasts hit Kampala in what is suspected to be a coordinated attack.
Four of those injured were in serious condition after an explosion at an explosives factory in Dzerzhinsk, 400 kilometres from Moscow.
Thursday's blast at the Tianjiayi Chemical plant in the city of Yancheng is one of China's worst industrial accidents in years.
Afghanistan's Health Ministry says at least six people were killed and 23 wounded in attack claimed by Daesh.
At least 42 people injured as a blast occurred in a restaurant in northern Japan's Sapporo city. The cause of the explosion is not known.
One of the attackers died early in the operation after detonating a suicide bomb but a second held out for several hours before being killed, said a provincial government spokesman.
Emergency services reported eight dead, but the miners' union said that 11 had died after a methane explosion.
Turkey's Transportation Minister says seven people, including police officers, were killed in two separate attacks in Mardin and Diyarbakır.
Coal mine blast caused by methane gas kills one worker, while at least 9 are still missing in Ukraine.
Massive explosion at chemical plant in China's Shandogn province leaves 2 people dead and 5 wounded
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