At least 90 people were killed by armed men in northwestern Nigeria, local media reported on Friday citing the region's police.

Iran Press/Africa: "An attack took place at Kadawa village of Zurmi local government where bandits took advantage of the night to strike on unsuspecting people and killed them in cold blood," a police spokesperson told the News Agency of Nigeria (NAN).

"On getting the news of the attack, the Commissioner of Police ordered combined units of security personnel to mobilize to the area, restore peace and confidence in the communities and track the perpetrators so that they can be brought to book," he added.

The attack, which took place on Thursday in a village in Zamfara state, was the latest in a spate of deadly attacks and mass kidnappings the region has seen in recent months.

Earlier on Friday, the governor of Zamfara told residents to take matters into their own hands and fight back against such attacks.

"I am calling on the people of the state to defend themselves if the bandits attack them," Governor Bello Matawalle was quoted as saying by the Nigerian Tribune daily.

"My government has approved that whenever the bandits attack you, do not wait for the security personnel to come to your rescue. You should rise and protect yourselves," he said.

Gunmen have ramped up attacks in the country's northwest region forcing thousands of people to flee to neighboring Niger.

The security situation in the northwest and central Nigeria remains fragile.

The rising violence presents a new challenge for President Muhammadu Buhari's security forces who have been locked in a war with the terrorists in the country's northeast for more than a decade.

The region has also been hit by a wave of criminal gangs kidnapping children in the hopes of securing ransom. More than 700 children and students have been kidnapped for ransom since December.

Earlier this month, Doctors Without Borders (MSF) warned that the Zamfara state is facing a humanitarian crisis.

The aid group said it had already treated 10,300 children in Zamfara between January and April for severe acute malnutrition, measles, malaria, and other conditions.

According to MSF, gunmen are increasingly sexually assaulting their hostages, and many rape survivors have not received treatment.

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