Mexico City (AFP) - When Pope Francis arrives in Mexico on Friday he will land in the most dangerous country for priests in Latin America, with dozens killed in the past decade.

The drug war that has killed tens of thousands of people in the past 10 years has also claimed the lives of at least 36 priests, targeted by criminal organizations, according to the Catholic Multimedia Center.

The latest victim was Father Erasmo Pliego de Jesus, whose burned body was found in November in Puebla, one of the most religious states in the world's second largest Roman Catholic country.

In April, Father Francisco Javier Gutierrez was found dead with a gunshot wound to the head in Guanajuato, another central state.

Alejandro Solalinde, a priest famous for his defense of migrants at a shelter in the southern state of Oaxaca, had to temporarily flee Mexico in 2012 after receiving death threats.

"We will kill you," said one of the blunt messages that Solalinde received.

"One of them even had a price on my head. They offered five million pesos ($400,000) to have me killed," said the 70-year-old priest.

Solalinde is now watched over by four bodyguards day and night while police guard his shelter.

In addition to the 36 priests assassinated since 2005, two more have disappeared, joining the macabre list of 26,000 missing people across the country.

Mexico is "the most dangerous country in Latin America to be a priest," ahead of other notoriously crime-riddled countries like Colombia, Brazil and Venezuela, according to the Catholic Multimedia Center.

Nelson Arteaga, sociologist at the Latin American Faculty of Social Sciences, said the deaths of dozens of priests since the government declared war against drug cartels in 2006 shows that they have not escaped the violence.

"Priests and nuns are targeted because we have gotten involved more and more in the human rights crisis of this country," Solalinde said.

"We are side-by-side with the victims and that makes us vulnerable to organized crime and its political arm."

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- Bulletproof vest -

The violence worries Mexico's Roman Catholic Church.

"It has been terrible. Many priests are continuously affected by organized crime because there are people who see priests as a symbol of certain values that they don't agree with," Archbishop Norberto Rivera told AFP.

In Mexico City, a metropolis of 20 million people, at least 400 priests have faced extortion and threats, Rivera said.

The most dangerous areas for priests are the states of Guerrero in the south and neighboring Michoacan in the west.

Pope Francis will visit Michoacan's capital, Morelia, on Tuesday.

The avocado and lime growing region is known for a conflict that erupted in 2013 between vigilante militias formed by farmers to combat the cult-like Knights Templar drug cartel.

Authorities had to provide security to Miguel Patino, the bishop of Apatzingan, a city once controlled by the cartel, over fears that he faced an imminent attack in 2013.

A priest in the same city at the heart of Michoacan's so-called "Hot Land," Gregorio "Goyo" Lopez, wore a bulletproof vest during mass.

- Mass grave -

While Francis is not visiting Guerrero, which became infamous following the disappearance and presumed massacre of 43 students, the state has seen horrific violence against priests.

A Ugandan priest, John Ssenyondo, was kidnapped as he left mass in a mountain region and his remains were found later in a mass grave with 12 other bodies in November 2014.

A month later, at Christmas, the body of Father Gregorio Lopez Gorostieta was found with a bullet hole in the head, three days after he was kidnapped by gunmen at a seminary.

"Enough already! We don't want more blood. We don't want more deaths," the Mexican Episcopal Conference pleaded after Gorostieta's murder.

Pope Francis sent a letter to condemn the killing and urge that Mexican priests "continue with enthusiasm their ecclesiastic mission, despite the challenges, following Jesus' example."