Yemeni and Swiss officials say a Swiss woman has been kidnapped in a western Yemeni port city.
Yemeni security officials say the women is a researcher at an institute in the city of Hodeida and that tribesmen kidnapped her on Tuesday.
Tribesmen in the area deny it, saying she was taken by militants to the southern province of Shabwa, an al-Qaida stronghold.
The Swiss Foreign Ministry confirmed Friday the abduction of its Swiss national. The Swiss say they are in contact with Yemeni authorities to ensure her release and safety.
All the officials and tribesmen spoke on condition of anonymity because they are not authorized to speak to the media.
Kidnapping of foreigners is frequent in Yemen, where hostages are used as bargaining chips to secure release of Yemeni prisoners or to get cash.