MODESTO, Calif. (KABC) -- An investigation is underway in Modesto after, authorities say, a 56-year-old California woman was attacked and killed by stray dogs.Stanislaus County Sheriff's Department deputies were dispatched to a 911 call of an unresponsive person in the 500 block of Crows Landing Road shortly before 8 a.m. Thursday.When they arrived, they found Deborah Onsurez of Modesto in the driveway of a home. Officials said she had severe injuries to her body, and she was pronounced dead at the scene.A preliminary investigation led detectives to believe the woman was killed by stray dogs, according to a press release from sheriff's officials.Deputies and Animal Control officers searched several businesses in the immediate area, and no stray dogs were found. Detectives do not have immediate information on the breed or ages of the dogs.Sheriff's officials said they were working with Stanislaus County Animal Services and the City of Modesto Animal Control to find the dogs.Residents in the area were urged to be careful. If you see any stray, vicious or aggressive dogs in the area, call Stanislaus County Animal Services at 558-7387, the City of Modesto Animal Control at 552-2470 or the Stanislaus County Dispatch at 552-2468.