Authorities arrested Nercy Montano, the mayor of Soyapango city, which is currently besieged by the military as part of the Salvadoran president's war against criminal gangs.
Gunmen target four villages in northwest Kaduna state, killing 15 people and wounding many others, local officials say.
Hundreds of armed bandits on motorcycles kill at least 17 people, including five policemen, in separate raids in northern Katsina state, officials say.
In the northwestern state of Kaduna, at least 34 people were killed and more than 200 homes were destroyed by heavily-armed criminal gangs.
Nigerian army rescued 180 people in the early hours of Friday, but around 30 male and female students remain unaccounted for after gunmen attacked a forestry college in northwestern Kaduna state overnight.
The pre-dawn attack on Tara village is the latest in a series of attacks by criminal gangs known locally as "bandits" who for years have terrorised communities. The attackers also stole 100 cows.
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