At least two people have been killed and a number of civilians wounded in the attack for which no group has yet claimed responsibility.
Kabul and several other provinces of Afghanistan have been rocked by deadly violence, including bombings, rocket attacks and targeted killings in recent months.
Kabul has been hit by a wave of deadly violence in recent months despite the Taliban and government engaging in peace talks to end the country's long conflict.
Iraqi officials said that twelve civilians have been killed and five wounded in an explosion on a bus at the main checkpoint for the northern entrance to Karbala.
Most of the victims belong to the Shia Hazara minority, which has been similarly targeted in the past.
The explosion at a supermarket in Russia's second-largest city on Wednesday was a terrorist attack, President Vladimir Putin said, adding that another attack had recently been thwarted.
A woman with a full body veil is alleged to have been the suicide bomber.
An explosive device, that was planted on a road by regime forces, detonated as a convoy of opposition fighters passed by.
Al Shabab claimed responsibility for the attack in Kenya's troubled northeastern region.
A suicide bomber killed himself and a police officer who was guarding a parade of local people.
Born in Manchester to Libyan parents, Salman Abedi was confirmed by police to be the bomber. A 23-year old that was arrested may be his brother.
An attempt to defuse a bomb in a car left by Al Shabab in the Somalia capital Mogadishu went horribly wrong.
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