Police have called off the river search three weeks after two sisters vanished in Scotland after a nighttime walk, authorities have confirmed, adding that the search remains ongoing.

Police said Jan. 29 that the river search relating to the disappearance of sisters Eliza Huszti and Henrietta Huszti in Scotland, has been called off over three weeks after they went missing.

Detectives looking for two missing sisters who “vanished into thin air” have called off the search of a river and harbour in Aberdeen following a three-week hunt. Eliza and Henrietta Huszti, both 32 and part of a set of triplets,