Triangular shaped formation of bright yellow dots over Luleå, SwedenThese two crafts the shape of triangles passed at rather high altitude above a forest nearby. The sun was a bit dimmed and I think this is the main reason we were able to see these crafts since they didn't have much of a distinct shape/matter, but several lights (my guess would be about 8 of them) created this triangular shape.Like mentioned this passed by very quickly, but a few friends also mentioned that they had seen something out of the ordinary. Something they, as well as I, were not able to explain. Can't be a helicopter, not an airplane, since there was no sound of these conventional flying vehicles to be heard.