BOGOTA - The death toll in the crash of a Colombian Air Force plane nearly doubled to 66 by Monday evening, two military sources told Reuters, as authorities continued to pull bodies from the wreckage.

The incident was one of the deadliest accidents in recent history for Colombia's Air Force, which also injured dozens.

The accident occurred as the Lockheed Martin-built LMT.N Hercules C-130 transport plane was taking off from Puerto Leguizamo, on the border with Peru, Defense Minister Pedro Sanchez said on X.

The plane was believed to have suffered an impact near the end of the runway as it was taking off, firefighter Eduardo San Juan Callejas told Caracol, with a wing of the plane later clipping a tree as it was plummeting.

The crash caused the plane to catch fire and detonate some sort of explosive devices on board, he added.

Residents of the remote area were the first to pull out survivors, with videos showing men speeding down a dirt road with wounded soldiers on the back of their motorcycles.

Military vehicles later arrived, though authorities said the crash site was difficult to reach, impeding rescue efforts.

Colombia's Air Force had initially reported a total of 121 people on board, comprised of 110 soldiers and 11 crew members. It was not immediately clear what accounted for the discrepancy with the figures reported by the local authorities.

MODERNIZING THE MILITARY

President Gustavo Petro, in the twilight of his administration, on Monday criticized bureaucratic obstacles for delaying his plans to modernize the military.

"I will grant no further delays; it is the lives of our young people that are at stake," he said in a post on X. "If civilian or military administrative officials are not up to this challenge, they must be removed."

Several candidates in Colombia's upcoming May 31 presidential election offered condolences and called for an investigation.

A spokesperson for Lockheed Martin said the company was committed to helping Colombia as it investigates the incident.

Hercules C-130 planes were first launched in the 1950s and Colombia acquired its first models in the late 1960s. It has more recently modernized some older C-130s with newer models sent from the U.S. under a provision that allows for the transfer of used or surplus military equipment.

Hercules C-130s are frequently used in Colombia to transport troops as part of the military's operations amid a six-decade-long internal conflict that has claimed more than 450,000 lives.

The tail number of the plane that crashed on Monday matches that of the first of three planes delivered by the U.S. to Colombia in recent years.

At the end of February, another Hercules C-130 belonging to the Bolivian Air Force crashed in the populous city of El Alto, barely missing a residential block.

More than 20 people died in that incident and another 30 were injured, and banknotes from the plane's cargo scattered around the crash site, prompting clashes between residents and security forces.

-Reporting by Luis Jaime Acosta in Bogota and Iñigo Alexander and Sarah Morland in Mexico City; Additional reporting by Mike Stone in Washington and Maria Paula Laguna and Kylie Madry in Mexico City; Editing by Gabriel Araujo, Julia Symmes Cobb, Chris Reese, Deepa Babington and Christian Plumb and Michael Perry/Reuters