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BNP Secretary General Mirza Fakhrul Islam Alamgir told a news conference on Wednesday that the former army officer Rahman 'went missing' while going to his home in Savar from Naya Paltan on Sunday night.
Mirza Fakhrul alleged government has a hand in the 'enforced disappearances'.
He also alleged the media were not covering such incidents with the importance they deserve.
"If such incidents are overlooked, no one will be safe," he said.
The BNP organised the conference to mark the International Day of the Victims of Enforced Disappearances.