"Journalist Shafik Rehman has admitted that he held several meetings with those who hatched the plot to abduct and kill him (Hasina's son Sajib Wajed Joy)," police spokesman Monirul Islam told reporters.
Rehman, 81, an editor and adviser to ex-premier Khaleda Zia, was detained over what was termed a plot to kill Joy. He was quizzed by police for the second consecutive day today under a five-day remand order since his arrest on Saturday.
Another official familiar with the investigation said police recovered several "confidential documents" of FBI about the plot during a search at Rehman's house.
"Rehman himself handed those (FBI) papers to us as we led him to his house under our custody after he admitted his links to the US-based plotters," police Detective Branch's deputy commissioner Mashruqur Rahman Khaled told newsmen.
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The developments came a day after Hasina said her government would definitely take actions against those who would be found involved in her the plot.
In 2015, a New York court convicted US-based BNP leader Mahmud Ullah Mamun's son Rizvi Ahmed Caesar for bribing former FBI agent Robert Lustyik to get information about Joy's activities in the US.
The allegations say some top leaders of the BNP and its allies met in the UK, the US and in the capital's Paltan and other parts of the country before September 2012 and conspired to abduct and kill Joy.
Meanwhile, BNP condemned Rehman's arrest and demanded his immediate release with its secretary general Mirza Fakhrul Islam Alamgir saying the government arrested him to divert peoples' attention from its numerous failures.'