(updated with new statements)

Washington, 23 mar (EFE) .- The transportation authorities said today that United abonera investigate the possible sobrecargadel airplane in Montana and crashed killing 14personas, but added that the investigation could take variosmeses.

The National Board for Transportation Safety (NTSB, porsus acronym) reports it has offered throughout the diasobre the accident, said the single-engine plane carrying board yesterday to a total of 14 people, but probably estabadisenado to eleven, including the two pilots.

victims, who started from Oroville (California), sedirigian on a ski trip to Bozeman (Montana).

Of the total, seven were adults and seven children were, segunprecisaron today the NTSB and the Federal Aviation Administration (FAA).

The local rescue crews had reported on Sunday 17victimas, but the figure was corrected after the start of research federal, said Efe to Laura Brown, spokeswoman for the FAA in Washington.

We are never the source of casualties, we rely initially on the local authorities in the field.

The truth is that nobody had been saved from such deaccidente, said the spokesman.

The investigation of the accident, which occurred when the aircraft at the airport in Butte seaproximaba in Montana, alguntiempo take, he said on his part, Mark Rosenker, acting chairman of laNTSB during a press conference in Butte.

He explained that the delay in the investigations is that elavion was not a black box recording because it was not a vuelocomercial and that there are no survivors who can provide additional algunainformacion.

We continue investigating the incident, documenting the apparatus losrestos and probably move to a hangar.

Everything is on the table, said Keith Holloway today Efe, an NTSB portavozde in Butte, the researchers emphasize that seven LaAgencia discussed all Possible causes of the accident.

The plane, a Pilatus PC-12 made in 2001, crashed in a uncementerio just 152 meters from the runway delaeropuerto Bert Mooney said Sunday a spokesman for the FAA, MikeFergus.

Rosenker said the plane had received the nod in paraaterrizar Butte airport and did not give explanations on sudesvio the town of Bozeman, about 129 kilometers aleste.

The pilot informed air traffic controllers had trouble deque when requested authorization to sudesvio, he said.

Butte airport does not have a radar for what the pilots have to rely on radio frequencies paradeterminar the presence of other aircraft in the area, according to authorities.

According Rosenker, for now it is premature to determine whether the posiblesobrecarga was the cause of the incident, because first queaveriguar have more data on the weight of passengers, cargo combustibley across the board.

He will try to determine why he had allowed more than three people, assuming that the plane tuvieracapacidad just for once.

Brown said the federal regulations for flights comercialesvarian from those applied to private flights . Siemprerecomendamos that each passenger has his own seat, except in the case of children under two years, he added.

Authorities have not identified the victims, segunmedios premises, including three families with young children .

At the entrance of the Holy Cross cemetery crosses have been placed yramilletes flowers to remember the victims.

Last month was a small plane crashed into a house ina suburb of Buffalo (New York), killing 49pasajeros and a man who was inside the lacquer.

In January, the pilot became Sullenberger Chesley heroeal achieve a landing of an airplane U.S. Airways on line elrio Hudson in New York City, without there being ningunavictima among the 155 people aboard. EFE