SAN ANTONIO -- The Alamo Heights Fire Department and State Fire Marshal’s Office are working together to determine what started a fire that killed a child and a woman.

• A 5-year-old child and his 67-year-old grandmother were killed
• Fire started shortly before 10:30 p.m. Sunday
• No working smoke detectors were found

Officials with Alamo Heights ISD were given permission by family to release a photo and the names of the two victims. The young victim was identified as 5-year-old Luke Cyr. The boy’s grandmother and guardian was the other victim identified as 67-year-old Joanne Cyr.

"The guys are taking it hard too because they wanted to get in and save everyone. But, in this particular case, when the crews arrived the conditions were already too far gone,” said Chief Buddy Kuhn with the Alamo Heights Fire Department.

The fire broke out shortly before 10:30 p.m. Sunday at the home located at the corner of Inslee Avenue and Columbine Street. Emergency crews arrived to thick black smoke coming from the back of the house.

“Our belief is the smoke conditions were just untenable for the victims. And, we were not able to locate any working smoke detectors in the house either. So you know, just didn’t get the warning if they were asleep. So, we’re just not certain exactly what happened,” said Kuhn.

Both the woman and child were rescued and rushed to SAMMC where they were both later pronounced dead. One neighbor who said she knew Joanne very well described her as a woman of faith and treated each other like family.

“We usually went to her house on Christmas; New Year's Eve. And, she had a luncheon. So, it was just a sweet friendship, and you know, we'd say, ‘I love you.’ at the end,” said Lynne Williams, who lives across the street.

Luke’s school sent out an email to teachers, staff and assistants Monday morning.

"It is with great sadness that I share that one of our students, Luke Cyr, and his grandmother and guardian, Joanne Cyr, died in a fire at their home on Sunday night. After speaking with Luke’s godmother, she said they were in heaven. The firemen said they died in their sleep and went peacefully. She was so thankful that they attended church together yesterday and Luke received his birthday blessing. He had a very happy day. I have attempted to call each staff member who worked directly with Luke, and our hearts are heavy at this news. We are all still working through how to best support the family, you, and other children and families at Howard."

"Our efforts are to focus now on the family and on ours. Obviously, it’s hard on the crew as well. We’ve had a local pastor that has come in and helped us out immensely. And, looking for counseling efforts for our personnel as well,” said Kuhn.

Officials say it could take days or longer to know an exact cause.