Boulder police are investigating two incidents last week during which groups of men in vehicles attempted to, and in one case forced a woman inside a vehicle, on University Hill.

Police stated in a news release that the first incident happened on Oct. 4 shortly after midnight. A woman leaving a party was walking near Mariposa Avenue and 20th Street, when a person came up behind her, choked her and forced her into the back of a white vehicle similar to a Subaru SUV.

A man in the back seat of the vehicle allegedly told the woman “just let me do what I want.” The three men inside the vehicle, described as white and between 18- and 22-years-old, drove around for about 10 minutes but let the woman go when they heard sirens.

The woman told police the driver of the vehicle had blonde, shoulder-length curly hair.

On Saturday, four or five women left a party between midnight and 1:30 a.m. and were walking on 11th Street near Pennsylvania Avenue when a light-colored sedan pulled up along side them. A passenger in the front seat asked the women where they were going.

When the women told the men to leave them alone, the passenger, described as a white man in his early to mid-20s with dark hair, pulled out a handgun and racked the slide. The driver then drove away northbound on 11th Street. The women told police that three or four men were inside the vehicle.

Boulder police have increased patrols in the area and are working with the women to investigate the incidents. They did not state whether they believe the incidents are connected.

Anyone with information is asked to call Detective Kurt Foster at 303-441-4329.

John Bear 303-473-1355, bearj@dailycamera.com or twitter.com/johnbearwithme