Another contrail at sunset is mistaken for a "UFO":
http://www.huffingtonpost.co.uk/2015/01/28/unexplained-floating-ball-of-fire-ufo_n_6561314.html
Very blurry and shaky video, and rather over-exposed.
Sunset contrails are explained here:
http://contrailscience.com/short-sunlit-contrails-look-like-ufos/
[Update] Some views of the "UFO" match this video of an A340 Contrail very well in shape if we simply assume the trail does not last as long, and it's viewed from the ground instead of a nearby plane:

Tracking the origin of the story is interesting:
HuffPo Wierd News got it from:
http://www.ufosightingsdaily.com/2015/01/ufo-shocked-residents-of-city-of-frias.html
With what looks like it was translated
http://www.nuevodiarioweb.com.ar/no...rana-luz-conmociono-vecinos-ciudad-frias.html
Which would put the date at Jan 23rd. (see below)
http://www.huffingtonpost.co.uk/2015/01/28/unexplained-floating-ball-of-fire-ufo_n_6561314.html
Very blurry and shaky video, and rather over-exposed.
Sunset contrails are explained here:
http://contrailscience.com/short-sunlit-contrails-look-like-ufos/
[Update] Some views of the "UFO" match this video of an A340 Contrail very well in shape if we simply assume the trail does not last as long, and it's viewed from the ground instead of a nearby plane:

Tracking the origin of the story is interesting:
HuffPo Wierd News got it from:
http://www.ufosightingsdaily.com/2015/01/ufo-shocked-residents-of-city-of-frias.html
With what looks like it was translated
This traces back to
Nuveo News States (Argentina):
A strange phenomenon was spotted yesterday afternoon which was recorded by several residents of the city of Frías, Choya department.
In the sky a strange light performing movements could be observed. This happened until the "point" disappeared.
Neighbors reported this phenomenon with their cell phone cameras and sent the information to the news Whatsapp Nuevo Diario.
"What we saw was like a meteor," he said some readers through the social network.
Others said: "In my house were all surprised. In the sky look like a point radiating light and moving from one side to the other. "
http://www.nuevodiarioweb.com.ar/no...rana-luz-conmociono-vecinos-ciudad-frias.html
Un extraño fenómeno se divisó ayer a la tarde que fue registrado por varios vecinos de la ciudad de Frías, departamento Choya.
En el cielo pudo observarse una extraña luz que realizaba movimientos. Esto sucedió hasta que el “punto” desapareció.
[translated]
A strange phenomenon was spotted yesterday afternoon which was recorded by several residents of the city of Frías , Choya department .
In the sky a strange light performing movements could be observed. This happened until the "point" disappeared.
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