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Protesters blockade state-owned oil refinery in southern Mexico

  • Police vehicles burn after teachers marching to demand justice for the 43 missing students, attacked the State Attorney General's offices in the state capital city of Chilpancingo, Mexico, Monday Dec. 1, 2014. According to Mexican officials, the students were detained by local police on Sept 26 in the city of Iguala, who apparently turned them over to a drug gang that reportedly killed them and incinerated their bodies but relatives remain skeptical of the government's version of the students fate. (AP Photo/Alejandrino Gonzalez)

    Police vehicles burn after teachers marching to demand justice for the 43 missing students, attacked the State Attorney General's offices in the state capital city of Chilpancingo, Mexico, Monday Dec. 1, 2014. According to Mexican officials, the students were detained by local police on Sept 26 in the city of Iguala, who apparently turned them over to a drug gang that reportedly killed them and incinerated their bodies but relatives remain skeptical of the government's version of the students fate. (AP Photo/Alejandrino Gonzalez)  (The Associated Press)

  • A masked protester walks past, as smoke rises from burning police vehicles after teachers marching to demand justice for the 43 missing students, attacked the State Attorney General's offices in the state capital city of Chilpancingo, Mexico, Monday Dec. 1, 2014. According to Mexican officials, the students were detained by local police on Sept 26 in the city of Iguala, who apparently turned them over to a drug gang that reportedly killed them and incinerated their bodies but relatives remain skeptical of the government's version of the students fate. (AP Photo/Alejandrino Gonzalez)

    A masked protester walks past, as smoke rises from burning police vehicles after teachers marching to demand justice for the 43 missing students, attacked the State Attorney General's offices in the state capital city of Chilpancingo, Mexico, Monday Dec. 1, 2014. According to Mexican officials, the students were detained by local police on Sept 26 in the city of Iguala, who apparently turned them over to a drug gang that reportedly killed them and incinerated their bodies but relatives remain skeptical of the government's version of the students fate. (AP Photo/Alejandrino Gonzalez)  (The Associated Press)

  • A police vehicle burns after teachers marching to demand justice for the 43 missing students, attacked the State Attorney General's offices in the state capital city of Chilpancingo, Mexico, Monday Dec. 1, 2014. According to Mexican officials, the students were detained by local police on Sept 26 in the city of Iguala, who apparently turned them over to a drug gang that reportedly killed them and incinerated their bodies but relatives remain skeptical of the government's version of the students fate. (AP Photo/Alejandrino Gonzalez)

    A police vehicle burns after teachers marching to demand justice for the 43 missing students, attacked the State Attorney General's offices in the state capital city of Chilpancingo, Mexico, Monday Dec. 1, 2014. According to Mexican officials, the students were detained by local police on Sept 26 in the city of Iguala, who apparently turned them over to a drug gang that reportedly killed them and incinerated their bodies but relatives remain skeptical of the government's version of the students fate. (AP Photo/Alejandrino Gonzalez)  (The Associated Press)

Protesters led by a teachers' union have blockaded a state-owned oil refinery in southern Mexico.

An official of Mexico's Pemex oil company said Monday the protesters had blocked roads leading into the plant, but had not entered the facility in southern Oaxaca state.

The official was not authorized to be quoted by name. He said the refinery in the township of Santa Maria El Tule had not shut down, but the protesters were preventing traffic in and out.

The protesters were demonstrating to mark the second anniversary of President Enrique Pena Nieto's administration, and to demand the government find 43 missing students.

The students were detained by local police in southern Guerrero state, who turned them over to a drug gang that reportedly killed the students and incinerated their remains.