Nigeria, March 3 -- The former Governor of Kaduna State, Nasir El-Rufai, has maintained that his investigation and detention by the Independent Corrupt Practices and Other Related Offences Commission (ICPC) is linked to his activity as a leading member of the African Democratic Congress (ADC), which he described as the "only surviving opposition political party" in the country.

Mr El-Rufai has been in ICPC custody since 19 February, after his release from days of detention by the Economic and Financial Crimes Commission (EFCC), which had detained him after he honoured an invitation on Monday, 16 February.

In statements he wrote on 19 and 20 February in ICPC's custody, Mr El-Rufai declined to respond to allegations laid before him by the...