Lagos - A media rights group has called for the immediate release of a senior journalist kidnapped from her home in Port Harcourt.
Unknown gunmen abducted Donu Kogbara, a renowned columnist for Vanguard newspaper on Sunday.
The motive for her capture was not clear.
"We condemn the kidnapping of Vanguard columnist Donu Kogbara and call on Nigerian authorities to launch an immediate and efficient investigation," Peter Nkanga, West Africa representative of the New-York based Committee to Protect Journalists (CPJ) said in a statement late Wednesday.
The press group urged authorities to do their utmost to find Kogbara, establish a motive for the abduction and apprehend and prosecute the perpetrators.
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It said Kogbara had worked for Vanguard newspaper for some 30 years, as well as for the BBC, Channel 4 and the Sunday Times and the Mail.
Kogbara's columns have often been criticized by readers for her strong opinions, CPJ said, adding that she had tacked wrongdoing in the previous administration.
"In July, Kogbara called for employees of former President Goodluck Jonathan who were allegedly returning money they had stolen to be "rounded up, one by one, and arrested, named, blamed, shamed, and jailed," it said.