Acting leader Yemi Osinbajo sacks head of the state security agency Lawal Musa Daura hours after masked security agents barred lawmakers from entering the parliament in capital Abuja.
Seiyefa is the erstwhile Director of the Institute of Security Studies (ISS) and the highest ranking director in the Service.
The Inspector-General of Police was the first to arrive at about 12.35 p.m before the arrival of the DSS Director General at about 1.15p.m.
The Federal Government has named the most senior director in the Department of State Service (DSS), Matthew Seiyefa, as the acting Director-General of the service.
"The unlawful act, which was done without the knowledge of the presidency, is condemnable and completely unacceptable", said a statement issued later by Osinbajo's office.
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The National Assembly was on Tuesday morning barricaded by the operatives, temporarily preventing lawmakers and staff from gaining access to their offices.
"The acting President was convinced that the IGP did not mobilize his men to the legislature and that was why he was not sacked along with the DG DSS", the source said.
These included the country's third most senior elected official, Senate President Bukola Saraki. "Seiyefa is also a member of the National Institute".
National chairman of the All Progressives Congress, Comrade Adams Oshiomole, held a crucial meeting with some senators in the party on Tuesday.
Mahmoud said, the action of the DSS was unconstitutional and poses a grave threat to the nation's democracy and called on the Acting President, Professor Yemi Osinbajo (SAN) to immediately call the security forces to order.