The victims' names and cause of death would later be released, the Denver, which is the capital of Colorado, Police Department said in a social media post, according to ABC News.
Police said earlier that investigators were at the scene of a shooting in the 5000 block of North Orleans Court.
Officers were working on gathering information about a possible suspect, police said.
Email and phone messages left for the department seeking more information were not immediately returned Sunday.
MNA/PR