Nigeria, March 28 -- The police said they have arrested 16 people for "complicity in a series of violent and unprovoked attacks on security operatives and facilities" around Nigeria, especially in the South-east region.

Several police officers have been killed lately in a string of attacks by gunmen, mostly around Nigeria's South-east and South-south regions.

Police stations are often the target of the attacks, which appeared coordinated. The gunmen would raid the armoury, cart away police rifles, and then set the stations on fire, during the attacks. Police vehicles on patrol have also been targeted by gunmen.

The spokesperson at the police headquarters, Frank Mba, announced the arrest of the suspects in a statement issued on Sunday i...