UPDATE: Boston police have confirmed that Wenham native Olivia Ambrose has been found alive and has been taken to a hospital for evaluation. This article will be updated. 

WENHAM — The Boston Police Department has released a photo of a "person of interest" in connection with a Wenham native who has been missing since Saturday night in Boston.

Olivia Ambrose was last seen in the area of 25 Union St. in downtown Boston on Saturday. Investigators said they have reviewed surveillance video and marked a timeline of events and locations in downtown Boston and Charlestown "in the hopes of better understanding the facts and circumstances surrounding Oliva Ambrose's disappearance," according to an update on the Boston Police Department's website.

The timeline is as follows:

11:04 p.m.: Ambrose is seen leaving a bar located at 25 Union St. (Hennessy’s) with a man who has since been determined to not be involved in her disappearance.

11:42 p.m.: Approximately 40 minutes later, two unknown men are observed inviting Ambrose to walk with them in the area of Congress  and State streets. One of the men appears to walk ahead while the second man places his arm around Ambrose and directs her toward the State Street MBTA Station.

12:01 a.m.: Approximately 20 minutes later, additional video shows Ambrose being accompanied by that same man, still with his arm around her, exiting the Bunker Hill Community MBTA Station in Charlestown. The other man is no longer observed in any surveillance video moving forward.

12:13 a.m.: Approximately 10 minutes later, Ambrose and the unknown man are observed again in the area of Green Street walking together toward Bartlett Street. A short time later, phone records indicate Ambrose’s phone was in the general area of the Bunker Hill Housing Development.

Ambrose is described as a 23-year-old white woman, about 5 feet, 2 inches tall, with blue eyes and curly brown hair. She was last seen wearing a red corduroy dress under a long white-and-gray coat.

Anyone with information regarding her whereabouts should call 911 or contact the Boston's District A-1 (Downtown) Detectives at 617-343-4248.

Community members wishing to assist the investigation anonymously can do so by calling the CrimeStoppers Tip Line at 1-800-494-TIPS or by texting the word "TIP" to CRIME (27463). The Boston Police Department said it will stringently guard and protect the identities of all those who wish to help the investigation in an anonymous manner.

Staff writer Paul Leighton can be reached at 978-338-2675 or pleighton@salemnews.com.

Recommended for you