RIO DE JANEIRO, Jan. 19-- A combination of factors caused the 2014 plane crash that killed Brazil's promising presidential candidate Eduardo Campos, an official report said Tuesday.

A final report on the accident was presented by the Air Force's Center for the Prevention and Investigation of Aircraft Accidents, first to the families of the victims and later to the press.

The plane was supposed to have landed at an airport in Santos, Sao Paulo state on Aug. 13, 2014. The pilot missed the landing and turned around for a second attempt, but ended up crashing into a residential neighborhood near the airport.

The report lists several factors that contributed to the accident: an unexplained detour as the plane came in to land, wrong landing procedures and bad weather.

Other factors blamed for the accident included reduced visibility, the pilot's state of stress, and a lack of training for that specific Cessna aircraft model.

The document does not blame any parties but only describes factors which may have affected the outcome, in order to help prevent similar accidents.

The document mentions that, though both pilots were experienced, there were signs that they were overworked and did not have enough rest in the days preceding the crash.

The report mentions that the wreckage of the plane was examined, with no mechanical failures found. The damage to both engines were also similar, indicating they were in a similar state before the crash. The plane did not catch fire before impact.

The crash killed the Socialist party candidate and six others, throwing the presidential race into turmoil less than two months before the elections.