Almost 30 people, including police officers and civilians, were hurt and police say the number could increase.
Investigators are trying to determine if the attackers were from the same armed group that staged similar bombings in past years to extort money from the Yellow Bus Line.
Russia's FSB security services say Ukraine was behind a car bombing in the outskirts of Moscow that killed Darya Dugina, the daughter of Russian intellectual Alexandr Dugin.
At least eight people were killed in the blast, which was claimed by Al Qaeda affiliated Al Shabab terror group.
A roadside bomb exploded in the northern Syrian district of Afrin, killing at least three people and injuring three others.
At least 36 people are wounded in an explosion at a military facility in the northeastern Cucuta city, near the border with Venezuela.
Initial reports put the death toll at 30 people after a car bomb blast targeted Afghan city of Pul-e Alam, the provincial capital of Logar province.
No one claimed responsibility for the bombing but President Ashraf Ghani blamed Taliban insurgents despite the spokesperson for the militant group denying links to the attack.
Neither Daesh not the Taliban have yet claimed responsibility for the attack that took place in Mihterlam, the provincial capital of Laghman province.
Car bomb targets government building in Ghani Khel district of eastern Nangarhar province, killing at least 15 people and wounding nearly 40 others, officials say.
At least five civilians were killed after an explosives-laden vehicle blew up in the town of Azaz. No one has claimed responsibility for the attack yet.
Meanwhile, the US has said its deal with the Taliban is in the "next phase" as it urged the militants to reduce rising bloodshed.
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