MEXICO CITY (AP) — A mayoral candidate and five other people were killed when gunmen opened fire at a campaign rally in the violence-wracked southern Mexico state of Chiapas, officials said.

State prosecutors said a young girl was among the six people killed in the gunfire late Thursday, along with mayoral candidate Lucero López Maza. Two others were injured, they said.

“A confrontation broke out between armed civilians during a political campaign event,” prosecutors said in a statement.

It was unclear whether López Maza was the intended target of the attack, because shootings have become so common and widespread in the area.

The mass shooting took place at a crossroads in the rural town of La Concordia, Chiapas, about 80 miles (125 km) from the border with Guatemala

The area near the Guatemalan border is a major smuggling route for drugs and migrants and Mexico’s two main drug cartels have been fighting for control of the region.