A woman was sexually assaulted in Georgetown early Sunday in an attack that had similarities to three incidents reported earlier in Montgomery County.

In all four cases, the victim was approached from behind while walking alone after dark in a neighborhood that is generally free of serious crime. In addition, the description of the assailant in each of the four incidents was similar in several ways, including the man’s build and attire.

In Sunday’s incident, D.C. police said the victim reported that she was walking in the 3200 block of Cherry Hill Lane NW, in a residential and commercial area just south of the C&O canal, when a stranger came up from behind.

The assailant groped the woman and fled, police said.

The most recent of the Montgomery attacks occurred four days earlier, about 11:25 p.m. Aug. 8, in the Bethesda area to a woman walking on Tuckerman Lane near Grosvenor Place. A man ran up from behind, wrapped his hands around her and touched her breasts, police said. She screamed, and he fled.

One of the previous Montgomery incidents occurred about 11 p.m. July 10, also near Tuckerman and Grosvenor. The other occurred about 10:20 p.m. June 5 near Landon Lane and Geranium Street in the Bethesda area. In each case, a man came up from behind, wrapped his hands around the woman’s body and fled when she screamed.

In the three Montgomery incidents, the suspect was described as white or possibly Asian, about 5 feet 6 to 5 feet 10 inches tall, with a thin build and dark hair. Two of the three victims said he wore a T-shirt and athletic shorts.

In the Georgetown incident, the assailant was described as white or Hispanic, about 5 feet 9 inches to six feet tall, with a slim build and dark hair. He was see in a black T-shirt and khaki shorts, police said.

A D.C. police spokeswoman could not be immediately reached for comment Tuesday night on the possibility of a connection between the assaults.