CIUDAD JUAREZ, Mexico — Gunmen shot dead an online journalist while he ate at a taco stand in the Mexican town of Ojinaga, which lies across the border from Presidio, authorities said Monday.

Jaime Gonzalez Dominguez’s news website, Ojinaga Noticias, reported that the 38-year-old journalist was shot at least 18 times with an assault rifle Sunday afternoon. The gunmen stole his camera and a woman who was with him was not wounded in the attack, the article said.

“This attack against journalism is a real shame,” the article said, adding that the story about the attack would probably be the last one it published.

Minutes later the website was taken down.

Ojinaga Noticias covered stories ranging from local sports to education, and on Monday it didn’t have any major reports about crime or drug trafficking.

Chihuahua state prosecutors’ spokesman Carlos Gonzalez said authorities have yet to determine a motive in the killing and that prosecutors don’t know if Gonzalez Dominguez had received threats.

The Association of Journalists of Ciudad Juarez, another border town in Chihuahua state, demanded a thorough and fast investigation.