The capture comes a day after Houthi rebels and members of the presidential guard reached a ceasefire agreement following unrest in Sanaa. The ceasefire started at 16:30 local time (13:30 GMT) after violent clashes outside the presidential palace earlier Monday.
Confrontation in Yemen started Saturday when presidential chief of staff Ahmed Awad Mubarak and two of his guards were kidnapped. Investigators suspect the Houthis, who had opposed Ahmed Mubarak's nomination for prime minister, to be behind the abduction.
The Houthis are the main opposition movement in Yemen, and played a major role in ousting the country's former leader Ali Abdullah Saleh in 2012. The group staged large-scale protests and occupied a number of cities in 2014, demanding the resignation of the government, which they say is corrupt and has marginalized the Shiite community.
In September 2014, the Houthi insurgency spread over to Yemen's capital Sanaa, and from there militia have advanced into central and western parts of the country.