Police officers trained in election security will be present at every voting centre in Nigeria, says the head of the force, who is promising to do what he can to ensure a "peaceful and secure atmosphere" next Saturday.

Inspector General Usman Alkali Baba also says the more than 310,000 police officers deployed will be supported by more than 90,000 additional security agents, and will be given air and marine assistance.

He also mentioned illegal arms trafficking, cyberbullying and kidnapping as issues that need to be tackled to ensure the election takes place safely.

Some 93.5 million people are registered to vote in the 25 February general election, according to the election commission.