A Pleasanton man lay critically injured in a coma Monday afternoon after police say he was severely beaten over the weekend while attempting to quiet a group of young people causing a disturbance in the street near his home.

Police dispatchers received a 911 hang-up call at 12:11 a.m. Saturday from the dead-end street of Middleton Place, and called back to learn of a group of people, possibly teens, making a significant amount of noise near an open field at the end of the street, Lt. Scott Rohovit said. When officers arrived to investigate the disturbance, they found a woman outside with her 51-year-old husband, who was lying unconscious and brutally beaten in the middle of the road.

According to police, the man had gone outside to investigate the unknown commotion and to address the group of people who were making it. While police would not immediately say whether the source of the noise was loud partying, fighting or some other suspicious activity, the commotion was enough to prompt the man to leave his house to address the source in the early hours of the morning.

Sometime between the time he left the house and the time he was discovered by police, he was attacked by one or more of the noisy individuals, authorities said. The man was taken to the hospital, where he remains in critical condition, unable to speak to investigators because he is in a coma.

Officials said a witness saw a dark-colored SUV leaving the neighborhood shortly after the beating, but there are no suspects in custody. It wasn't immediately known if the suspects were linked to any of the homes in the area.

"We want to resolve this, and we are actively investigating it," said Rohovit, who added that officers were headed back to the neighborhood Monday evening to talk to various residents and witnesses. "We need to get to the bottom of this, to find out who did this."

Anyone with information about the case is asked to call Pleasanton police at 925-931-5100.

Contact Erin Ivie at eivie@bayareanewsgroup.com. Follow her at Twitter.com/erin_ivie.