UPDATE: The missing swimmer was located just before 10 p.m. on Sunday. She is alert and being assessed by EMS.

MYSTIC, Conn (WTNH) — The Coast Guard is responding to a missing swimmer about 1.5 miles south of Mason’s Island in the Mystic Harbor.

The swimmer is a 42-year-old female, according to officials.

Stay tuned with News 8 for updates as they become available