Nigeria, April 2 -- The United Bank for Africa (UBA) says it has strengthened the security of transactions on its mobile application to stop fraudulent debits, unauthorised transfers and withdrawals.

UBA announced this in a memo forwarded to its customers via email on Tuesday.

"We are pleased to inform you that we have further strengthened the security of transactions on the Mobile App.

"Updated authentication options now apply based on the value of transfers," the memo reads in part.

UBA said in the memo that it had introduced authentication options for transactions of varying amounts to detect and prevent fraud.

According to the bank, transactions of N200,000 or more will now require customers to provide their Personal Identificati...