International experts claimed that the Mexican government has falsified its probe into the case of Mexico's 43 students missing.

The group of international experts released video footage that seems to show the military planting evidence at the scene where authorities later said that students were murdered, according to an Aljazeera News report.

Experts said that the Mexican government withheld or falsified evidence as it probed what happened to the students, even from the start.

Meanwhile, Mexican President Andres Manuel Lopez Obrador has denied accusations that his government withheld and concealed information about the disappearance of the 43 students, according to a Manila Bulletin report.

The Mexican president spoke about the case a day after a group of experts accused Mexican authorities of withholding important information, drawing international condemnation and shocking the country.

Lopez Obrador said that all information is being handed over and have been handed over. He added that the files have been opened like never before.

Lopez Obrador also said that "absolutely nothing is hidden."

The 43 students missing were detained by local police in Iguala in the southern state of Guerrero.

Former Colombian prosecutor Angela Buitrago, who is part of the Inter-American Commission on Human Rights group, said that the investigation was falsified from the start up to the last day.

The experts obtained a government drone video, which shows Mexican marines and police climbing the area where authorities have maintained the students were killed.

It was done shortly after the 43 students went missing.

One clip shows marines standing in an area of Cocula rubbish dump where federal investigators later found bullet shells.

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'Falsifying' Probe of Mexico 43 Students Missing

Buitrago said investigators, prosecutors, and military personnel had altered crime scenes and records.

The investigation has long been scrutinized by the families of the 43 students who disappeared in September 2014 after they were detained by local police in the southern state of Guerrero, according to an ABC News report.

The 43 missing students were allegedly handed over to a drug gang and were killed. People have not heard from them ever since.

Many of the suspects involved in the case were arrested and were later released. Many claimed that they had been tortured by police or the military.

An Inter-American Commission on Human Rights 2015 investigation earlier said that the scenario presented by the government was "scientifically impossible."

The Mexican government said that the students had been killed and burned in the garbage dump. Experts have subsequently questioned those findings.

Mexico: 43 Students Missing

The Institute of Genetics at the University of Innsbruck, in Austria, tested bone fragments found near where the students disappeared. It was identified as the remains of Christian Alfonso Rodriguez Telumbre, who is one of the students.

The special prosecutor assigned to the case, Omar Gomez Trejo, said that forensic experts from Argentina had confirmed the findings, according to The New York Times report.

Trejo said at a news conference that they have broken the pact of impunity and silence regarding the case.

Meanwhile, Mexican President Andres Manuel Lopez Obrador promised to prioritize the investigations and considered the discovery a victory.

Lopez Obrador said that it is a very serious justice issue and that they are going to formally file a complaint with the attorney general's office and the judiciary in this case, according to The Guardian report two years ago.

Independent experts noted even then that there was no evidence to support the conclusion.

Alejandro Encinas, deputy interior secretary, said that the poorly named "historic truth" was built with a foundation of cover-up, as well as fabrication of evidence and torture to benefit the suspects.

Encinas said that the considered historic truth "collides with reality."

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Written by: Mary Webber

WATCH: Seven years after Mexico's deadly abduction of 43 students - from Al Jazeera English