Mexico's National Commission of Human Rights is investigating two possible cases of negligence involving indigenous woman giving childbirth, one of whom died.

The commission said Sunday the woman died in the southern state of Oaxaca on Tuesday, a year after slipping into a coma from an infection contracted when scissors were left inside her womb.

She developed went into a coma in February 2013, several days after delivering twins by cesarean section at a rural hospital.

In another case, the commission says an 18-year-old indigenous woman gave birth in the bathroom of a shelter next to a hospital in Oaxaca's southern Sierra because she was refused medical care.

Mexicans were outraged by two similar cases in October, including a woman photographed giving birth on a medical clinic lawn.