The cellphone of Taylor Casey has been located in the Bahamas, authorities said Tuesday as the mother of the missing 41-year-old Chicago woman calls on the United States to take over the investigation.

Casey was on the Caribbean island to attend a yoga certification program and was reported missing the night of June 20 by the Sivananda Ashram Yoga Retreat after she failed to show up for class. She was last seen at the Paradise Island yoga school the night before.