THORNTON, Colo. A man in Thornton is believed to have fatally shot his family before turning the gun on himself Friday night, according to officers with the Thornton Police Department. A murder-suicide investigation is now unde rway.The gruesome crime was discovered after officers from the Thornton Police Department responded to a home along Harrison Street just after 8 p.m. Police said a family member reported multiple individuals were unresponsive in the home.Watch the latest on this story in the video below: Thornton police investigating murder-suicide after family of 4 is found dead inside homeUpon entering the home, officers found two men, a woman, and a juvenile dead with apparent gunshot wounds, according to a news release from Thornton police."Based on the initial investigation, detectives believe one of the adult males, a 33-year-old, fatally shot the three other family members before dying by suicide," a spokesperson from the department said. If you or someone you know is struggling with mental health, you can dial 988 for the Suicide and Crisis Lifeline 24/7, visit Colorado Crisis Services, or click here for a list of resources in Colorado.The identities of all four are being withheld pending positive identification by the Adams County Coroner's Office and notification to family, police said.Officers added there is no known threat to the community and that their investigation is ongoing. Anyone with information is encouraged to contact the Thornton Police Department tip line at 720-977-5069. "The entire Thornton Police Department is deeply saddened by this tragedy and extends its condolences to the family and loved ones of everyone involved," a Thornton PD spokesperson said. "We recognize that incidents like this are difficult for neighbors and our entire community. Those in need of support are encouraged to seek available resources."The Thornton Police Department, their Victim Services Unit, and their Co-Responder Team are available to provide support and can be reached at 720-977-5150, or by calling 911 in an emergency, the spokesperson said. ...read more read less