UPDATE Monday night: Wellesley Police issued the following update:

The Wellesley Police Department Bureau of Criminal Investigation (BCI) is investigating a reported sexual assault that occurred on Edmunds Road on November 28, 2011 at 1:13 PM.

The Wellesley Police Department Emergency Communications Center (ECC) received a call at 1:13 PM from a female party reporting a break in at a dwelling on Edmunds Road. The victim reported that the suspect was armed with a firearm and had sexually assaulted her. The suspect was described as a black male, with thinning hair, and wearing all black clothing. The suspect was also wearing gloves, and fled out of the rear of the dwelling.

Members of the Wellesley Police Department searched the immediate and surrounding areas for the suspect. The Massachusetts State Police Airwing responded to the scene with a helicopter to assist in the search. Several K9 (police tracking dogs) units also assisted in the search of the neighborhood. The suspect was not located.

UPDATE Monday afternoon: Later reports said the suspect was armed but that he was also thought to be out of the Edmunds Road area by late afternoon. Police scoped out the area by foot, car and helicopter. Neighbors spoke to the Townsman about their concerns. Channel 5 had its news copter high above the scene and produced this video report on the incident, as did NECN and Channel 7, as seen here.

From Wellesley Police Department:

The Wellesley Police Department is investigating a sexual assault which occurred on Edmunds Road. The suspect fled on foot and is described as a black male with very little hair wearing all black clothing and blue gloves. This is an active incident and no additional information is available at this time. The State police K9 and airwing are assisting in the search. If you see someone fitting the description of the suspect, DO NOT APPROACH THEM and call 911 immediately.

Wellesley Police video statement on reported sexual assault: