Ahmed Awad bin Mubarak, who is also secretary general of the national dialogue set up to oversee the political transition, was seized by gunmen at a checkpoint in Yemen's southern Hada district.
A statement by the Shiite Huthi militia said the kidnapping was a measure to prevent a UN-brokered agreement between the presidency and them in September "from being broken."
The chief of Yemen's national security service, General Mohammed al-Ahmadi, told reporters "talks are ongoing to secure his release."
GMT 06:12 2017 Monday ,24 AprilPhilips posts first quarter jump in profits
GMT 06:10 2017 Monday ,24 AprilIn call with Trump, Xi urges 'restraint' on N. Korea
GMT 06:08 2017 Monday ,24 AprilTokyo shares up 1.4% as centrist Macron leads French presidential race
GMT 06:06 2017 Monday ,24 AprilEuro rises sharply after first round of French election
GMT 06:04 2017 Monday ,24 AprilJuncker congratulates Macron on French election result
GMT 03:55 2017 Monday ,24 AprilFrance's Macron: 'will carry hope of our country and Europe'
GMT 03:51 2017 Monday ,24 AprilMerkel spokesman wishes France's Macron 'all the best'
GMT 03:46 2017 Monday ,24 AprilJuncker congratulates Macron on French election result