>> These are forces from Nigeria's spy service blockading the country's parliament. It's not clear why they did it and they stopped after about an hour. But the Vice President called it a quote, unauthorized takeover and quickly fired the agency's head. Reuters' Alexis Akwagyiram is in the capital, Abuja.
>> The use of the Department for State Security in this way is unprecedented since Nigeria entered civilian war in 1999. Now, you need to think about the DSS as essentially the secret police. They're a combination of the FBI and the CIA. And in past administrations, they have been used to some extent limitedly as a way of basically exerting influence.
So, an administration could use them to crack down somewhat on political opponents. But this has been roundly criticized by people on both sides of the political divide.>> It happened while President Muhammadu Buhari was out of the country on vacation. His Vice President, Yemi Osinbajo said the executive had no role in the incident but offered no possible motive either.
Meanwhile, the opposition is alleging that Buhari really was behind it as a way to send a message, show some muscle. This government worker says he asked the armed men why they were doing this, but no one would talk.>> It's worth noting the background, Nigerian politics is increasing intense.
In the last few weeks, we've seen a number of defections. So people have gone from the ruling party to the main opposition party, the PDP. A number of sources say, that this is in some way, related to these defections and there was soon to be some form of meeting involving those who had defected.
And that the security forces wanted to crack down and stop this meeting from taking place in parliament.>> Nigeria is due to hold elections next year.