The State Security Service (SSS) on Thursday raided the residence and office of Tukur Mamu, lead negotiator of Abuja-Kaduna train abductees.
The operation said to have took place early in the morning comes few hours after he was arrested in Egypt and repatriated back to the country Wednesday afternoon through the Aminu Kano International Airport.
The self-styled Department of State Services (DSS) reportedly carted away some computers, phones and other gadgets during the raid.
Mr Mamu, who negotiated with terrorists that attacked the train in March and got few of the hostages released, was awaiting a connecting flight to Saudi Arabia for lesser Hajj before being picked up by the Interpol on the request of the Nigerian government.
He pulled out of negotiating with the terrorists after alleging threat to his life months ago.
Quoting family sources, Premium Times reports that his wives who were with him when he was arrested and repatriated have been released while he is still being detained alongside his son, Ibrahim and his son-in-law Faisal.