Honduran authorities are holding four people for questioning about the disappearance of Maria Jose Alvarado, Miss Honduras 2014, and her sister four days ago in a city near the Guatemala border.

Police spokesman Lt. Joseph Coello says one of the detained, Plutarco Ruiz, is the boyfriend of Alvarado's sister, Sofia, who is also missing.

The two women were last seen in a spa in Santa Barbara, about 240 miles (400 kilometers) west of Tegucigalpa, where they had gone to celebrate Ruiz's birthday. Coello said Monday the case is being treated as a disappearance. There has been no ransom request.

Alvarado, 19, was crowned Miss Honduras in April and is expected to compete in the Miss World Pageant in London next month. She was supposed to leave for London on Sunday.