GREENWOOD VILLAGE - The three children reported missing late Tuesday night have been found safe. Their father - who police believe was responsible for their disappearance - was found dead in his car south of Castle Rock Wednesday morning. Their mother was found dead at their Denver home late Tuesday night.

"It's a really sad situation when anybody loses their life," Sgt. Steve Warneke, Denver Police, said. "Now, we are investigating this as a murder-suicide. It's awful especially when there's children involved."

The children - a 5-year-old boy, 18-month-old girl and 15-year-old boy - were first reported missing late Tuesday night. An Amber Alert was issued early Wednesday morning. The 5-year-old and 18-month-old were found in the 10400 block of East 14th Avenue in Aurora, and the 15-year-old was located out of state, where he had been visiting.

"I don't know if (the younger children) were here at the time or if they were there at the time," Warneke said."The important partfor us is that they were safe and sound."

Police found the father's car before 7 a.m. Wednesday morning in Douglas County. The man was found dead from apparent self-inflicted gunshot wounds.

Denver Police say the children's disappearance was linked to the mother's suspicious death at 21081 E. 46th Avenue. Police were called to the home on a welfare check just after 10:30 p.m. Tuesday night, when they said they found her body inside the home.

Her cause of death is still unknown and the identities of everyone involved have not been released.

The children lived inside the home with their parents, who were married, according to Denver Police.

Neighbors say they appeared to be a nice family who offered no trouble prior to these tragic events.

"One time, probably six months ago, I saw a police car over there," Paul Bakke, neighbor, said. "But, there really hasn't been much activity over there that I am aware of."