No one immediately claimed responsibility for the blast that hit a bus carrying employees of an oil company.
No group has claimed responsibility for the violence, but Nigeria faces a myriad of security challenges, including an insurgency in the northeast, kidnappings in central and northwestern states and separatist tensions in the south.
Authorities in both the countries are yet to confirm the death of the journalist, whose wife has tweeted that he was shot dead in Kenya's capital Nairobi, according to local media.
Four soldiers have been killed in a suicide bomb attack in a former Pakistani Taliban stronghold in northwestern Pakistan.
Six soldiers were killed in Sokolo while 12, including 3 civilians, were killed in Kalumba, in the Nara region.
The attack, claimed by Al Shabab militant group, occurred outside the administrative office in the town of Marka, police said.
More than 200 people, mostly from ethnic Amhara, have been killed in Ethiopia's Oromia region in an attack being blamed on a rebel group known as Oromo Liberation Army.
No group has claimed responsibility for the attack, which killed at least one worshipper and wounded seven more inside a mosque in Kunduz province.
Public anger mounts in Nigeria as the Ondo state police is yet to trace church attackers that are said to be at least five in number.
At least 12 civilians were killed after two separate attacks targetted Kirkuk and Diyala provinces, where farmers were harvesting their crops.
The terrorist group, which has been waging a deadly insurgency against Somalia's fragile central government for more than a decade, claimed responsibility for the assault.
Authorities are investigating whether the attack was related to smuggling or tensions between Serbia and Kosovo.
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