Unidentified gunmen have kidnapped Joseph Agama, the younger brother of Nigeria's oil minister and current OPEC president Diezani Alison-Maduekel, in the southern Bayelsa state.
Bayelsa is located in the Niger Delta, it's the main oil-producing region in the country, TASS reports.
Early in 2014, Nengite Nitabai, the 71-year-old uncle of President Goodluck Jonathan, was kidnapped in Bayelsa. He was later rescued by police.
On January 1, 2015 Alison-Madueke became the first woman to hold the rotating presidency of the global oil cartel.