On Saturday, Brazilian authorities completed the recovery of the 62 bodies from the plane crash. Meanwhile, experts have begun analyzing the aircraft’s black boxes to investigate the cause of the tragedy.

Videos showed the ATR 72-500 plane in a sickening downward spin Friday before it crashed into a residential area in the town of Vinhedo, some 80 kilometres (50 miles) northwest of Brazil’s financial capital Sao Paulo.

The plane operated by airline Voepass fell almost vertically, landed on its belly and exploded in flames, striking with such force that it was nearly “flattened,” said Sao Paulo fire lieutenant Olivia Perroni Cazo.

“A total of 62 bodies (34 male and 28 female) were recovered and taken to the morgue in Sao Paulo for identification and delivery to their families,” the regional government said Saturday evening.

Two have already been identified through fingerprints, with Vinhedo Mayor Dario Pacheco saying they were the pilot and co-pilot.

The twin-engine turboprop, built by aviation firm ATR, was flying from Cascavel in southern Parana state to Sao Paulo’s Guarulhos International Airport.

Experts from Brazil’s Aeronautical Accidents Investigation and Prevention Center (CENIPA) have begun analyzing two black boxes recovered from the wreckage, containing cabin conversations and in-flight data, said the center’s chief, Marcelo Moreno.

It plans to publish a preliminary report “within an estimated 30 days,” the Brazilian Air Force said.

According to the Flight Radar 24 website, the plane flew for about an hour at 17,000 feet (5,180 meters), until 1:21 pm (1621 GMT) when it began losing altitude at a catastrophic rate.

Radar contact was lost at 1:22 pm, the air force reported. It said the plane’s crew “at no time declared an emergency or were under adverse weather conditions.”