Gunmen on motorcycles opened fire outside a weekly market in northwest Nigeria, killing civilians and policemen, authorities say.
"A regional force will intervene in the event of need, whether this is in the area of security, terrorism and restore constitutional order in member countries," says president of the ECOWAS commission.
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.
Gunmen target four villages in northwest Kaduna state, killing 15 people and wounding many others, local officials say.
Three buses collide outside northeastern Maiduguri city, leaving at least 37 people dead, many "burnt beyond recognition," officials say.
Study blames "human-caused climate change" for floods that mainly struck Nigeria but also hit Niger, Chad and other African countries displacing over 1.4 million people.
Kidnappers have abducted about 80 people in separate attacks and killed at least 11 people, say residents.
"Terror is a reality the world over. However, it does not mean an attack in Abuja is imminent," says President Muhammadu Buhari's office, after several countries warned of potential attacks, panicking Nigerians and forcing Abuja to boost security.
Washington orders its non-emergency employees and their family members to depart the West African country's main city, citing a "heightened risk of terrorist attacks."
Nigeria urges residents to stay calm and take "necessary precautions," with police ordering a counterterrorism exercise in Abuja, where US and UK warn of possible terror attacks.
Cattle herders storm local farming settlement in central Benue State, leaving at least 18 people dead, officials say.
The latest accident happened just two weeks ago after 76 people were killed when their overloaded boat tipped over due to flooding in southeastern Anambra state.
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