Colombian authorities are searching for answers after the air crash that wiped out the Chapecoense football team

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Experts have launched a probe after a charter plane carrying a football team whose Cinderella story took them to the finals of one of South America's most prestigious regional tournaments crashed into Colombia's Andes mountains, killing all but six of the 77 people on board.

The British Aerospace 146 short-haul plane's crew declared an emergency and lost radar contact just before 10pm local time on Monday (3am GMT on Tuesday), according to Colombia's aviation agency. It said the plane's black boxes had been recovered and were being analysed.

The aircraft, which departed from Santa Cruz, Bolivia, was carrying the Chapecoense team from southern Brazil for Wednesday's first leg of the two-game Copa Sudamericana final against Atletico Nacional of Medellin. Twenty-one Brazilian journalists were also on board.

Air crash
(Luis Benavides/AP)

Colombian officials initially said the plane suffered an electrical failure but there was also heavy rain at the time of the crash.

Authorities said they were not ruling out the possibility, relayed to rescuers by a surviving flight attendant, that the plane ran out of fuel minutes before its scheduled landing at Jose Maria Cordova airport outside Medellin.

The emotional pain of Colombia's deadliest air tragedy in two decades was felt across the football world.

Plane crash
(Andre Penner/AP)

Expressions of grief poured in as South America's federation cancelled all scheduled matches in a show of solidarity, Real Madrid's squad interrupted its training for a minute of silence and Argentine legend Diego Maradona sent his condolences to the victims' families on Facebook.

Brazil's top teams offered to loan the small club players next season so they can rebuild following the sudden end to a fairytale season that saw Chapecoense reach the tournament final just two years after making it into the first division for the first time since the 1970s.

"It is the minimum gesture of solidarity that is within our reach," the teams said in a statement.

Air crash
(Fernando Vergara/AP)

Rescuers working through the night were initially heartened after pulling three people alive from the wreckage. But as the hours passed, heavy fog and stormy weather grounded helicopters and slowed efforts to reach the crash site.

At daybreak, dozens of bodies scattered across a muddy mountainside were collected into white bags. They were then loaded on to several Black Hawk helicopters that had to perform a tricky manoeuvre to land on the crest of the Andes mountains.

The plane's fuselage appeared to have broken into two, with the nose facing downward into a steep valley.

Air crash
(Luis Benavides/AP)

Officials initially reported 81 people were on board the flight, but later revised that to 77, saying four people on the flight manifest did not board the plane.

Three players were among the survivors. Alan Ruschel was reported to be in the most serious condition, facing surgery for a spinal fracture. Teammates Helio Zampier and Jakson Follmann also suffered multiple injuries, and doctors had to amputate Follmann's right leg.

A journalist also underwent surgery and two Bolivian crew members were in a stable condition, hospital officials said.

Air crash memorial
(Andre Penner/AP)

The aircraft is owned by LaMia, a charter company that started off in Venezuela but later relocated to Bolivia, where it was certified to operate last January. Despite such apparently limited experience the airline has a close relationship with several premier South American squads.

"We can't rule out anything. The investigation is ongoing and we're going to await the results," said Gustavo Vargas, a retired Bolivian air force general who is president of the airline.