Line of bright white illuminated projectiles

girlfriend and I saw between 10-12 white illuminated objects moving from an SW to NE direction in the sky at night. They appeared to be coming from ground-level, reaching several thousand feet into the air. They were fairly slow-moving and faded-out seconds after first appearing on the horizon. The looked similar to flares, but were slower, bright white and all following the same path, forming a perfect line in the sky. They were spaced about a second apart from one another.