Police said a 6-week-old boy who they believed was in danger was found safe on the sidewalk outside of a church Friday afternoon, hours after his mother and two young brothers were found dead after a suspicious fire in their home.

The infant, Maurice Visor, was found in good condition in a baby carrier in the city's north side, Police Chief Ed Flynn said at a brief news conference.

"Our investigation into how the baby went missing continues," Flynn said.

Police were searching for 20-year-old Brittney Robertson, who lived in the family's home.

Investigators were treating the deaths of Maurice's mother, 24-year-old Rachel Thompson, and brothers, 4-year-old Torian Thompson-Carter and 3-year-old Jaden Thompson-Carter, as homicides, Police Capt. Kurt Leibold said.

Flynn said he wouldn't discuss how they died because doing so could jeopardize the investigation.

When asked whether Robertson was a suspect, Flynn would only characterize her as a missing person whose safety was in question.

"We have reasons to be concerned about her and we want her found," he said.

Firefighters found the dead family members on the second floor of their duplex while battling a blaze at the home early Friday.

Three people who lived downstairs from the family escaped the fire.

Diana Baldwin, 58, who has lived next door for about a year, said she had never heard any disturbances or loud noises from the mother's home.

"They were quiet. They mainly kept to themselves," Baldwin said.

Flynn said police recovered the baby after receiving a telephone call about his location. Flynn said he didn't know whether the baby had been dressed in winter clothing. Temperatures were in the low 30s at the time.

Earlier Friday, officers strung yellow police tape to block off a one-block radius around the house. Several neighbors watched the investigators through the windows of their homes but declined to come out and speak with reporters.

Across the street, three red roses lay near a stop sign under the police tape.

One passer-by stopped outside the tape and stood silently for a few moments. When a reporter approached him he said quietly, "If you talk to the family, tell them the whole neighborhood is hurting. Tell them we all offer our condolences."

Then he turned and walked away, declining to give his name.