Fleet of UFOs spotted over Luleå, Sweden

On February 7, 2018, a witness saw a fleet of triangular-shaped UFOs over Luleå, a city located on the coast of northern Sweden. What is it?

Eyewitness statement:

I was walking towards the bus and randomly looked up in the sky because the sun was shining and there they were 6-8 diamond/triangle shaped flying in a wide line all the objects were black. No noise were made by them. Another strange thing was that after I took photos on my smartphone I could still see them in the sky but couldn't catch them in a video.

https://mufoncms.com/cgi-bin/report_handler.pl?req=view_long_desc&id=91730, 02th May 2018