MEXICO CITY — The governmental human rights commission said Tuesday that immigration agents violated the rights of a Mexican teen who was stopped at a checkpoint because they thought she was Guatemalan.

She was 17 at the time and did not have identification proving her nationality. She was pulled off a bus, interrogated by agents and released. She missed her bus and disappeared and has not been seen since.

The rights commission said the incident occurred in 2015 in the southern border state of Chiapas, where many residents are of Mayan Indian ancestry as are many Guatemalans.

The commission said a witness told the victim’s brother the agents thought she was Guatemalan. The agents said they let her go later, but she wandered off.

The commission said the case must be investigated as a “forced disappearance,” a crime defined as the disappearance of a person who was taken away by authorities.

Also Tuesday, the federal Attorney General’s Office said it had rescued 133 migrants from Guatemala, El Salvador and Honduras who were being held against their will at a ranch in the southeastern state of Tabasco.

Agents got a tip that people were being held at the ranch, and when they arrived, they found the migrants including 34 minors. Two suspected captors were detained.

Kidnappers, extortionists and immigrant traffickers in Mexico frequently hold Central American migrants and call their families in the United States to demand ransom payments.