The central bank of Nigeria has bailed out four more banks.
The rescued banks - Equitorial Trust, Bank PHB, Spring Bank and Wema Bank - were given 200 billion naira ($US1.37 billion) in loans and support on Friday. Their chief executives were sacked.
After an audit of their books, the central bank said they were "adjudged to be in a grave situation".
The BBC reports another bank, Unity, does not have sufficient capital but has enough to avoid being in a grave situation.
Central bank governor Lamido Sanusi took office in June and has now completed an examination of all of 24 banks in the country.
In August, Mr Sanusi injected a total of 400 billion naira into five banks - Afribank, Intercontinental Bank, Finbank, Oceanic Bank and Union Bank - after they were found to have very low cash reserves and fired their senior management.
They had run up bad loans totalling a collective 1.14 trillion naira.
Four chief executives have now appeared in court charged with fraud.
The Economic and Financial Crimes Commission says nearly $US300 million in bad debt has been recovered, but billions are still outstanding.
