The two-story home, with its charred outer walls, shattered windows and stinging odor, was evidence of a catastrophic fire.

The blaze killed seven people on Friday.

The makeshift "foster home" was at the end of a narrow lane in the center of Lankao, Central China's Henan province.

Yuan Lihai, a woman who never received a formal education, had nursed more than 100 abandoned children there since 1986. Most of the children suffered congenital diseases, ranging from cleft lips, infantile paralysis and albinism to mental disorders.

Yuan, 48, who was not injured in the fire but has since suffered a heart attack, was seen as a good Samaritan by her neighbors.

"Many of the children would have died if she had not taken them in," a neighbor told Xinhua News Agency. Others also praised her.

Du Peng, Yuan's son, described his mother as a woman with a warm, outgoing personality. "Everyone knew she took in abandoned children. Some sent over ill babies, while others just left them on her doorstep in the middle of the night."

Not all members of Yuan's family supported what she was doing, and it caused her to separate from her husband.

Friday's deadly fire has put Yuan under investigation.

While the cause of the fire remains unclear, some were blaming Yuan because her shelter for abandoned children was unlicensed and therefore considered "illegal".

However, the local government apparently turned a blind eye, according to Fu Ping, a Shanghai-based specialist on the protection of children's rights.

Lankao, with a population of 760,000, is among the poorest counties in the underdeveloped central province of Henan.

The county doesn't have an orphanage. A plan for a 1-million-yuan ($160,477) welfare home was approved last week by the Ministry of Civil Affairs.

"Yuan never went through official procedures for adoption, but she certainly helped the local government tremendously by taking care of so many children," Fu said.