A craft that turns invisible

I was driving down broad st home & noticed a large craft unmoving in the sky. It was lower than all the planes at the local airport & had no blinking lights. Just two massive ones on each side. It was pointing at me. The sky is perfectly clear. What was astonishing was that I parked my car & got out to see it & I watched it slowly disappear from one side of the craft to the other & then I saw several smaller orbs jet across the sky. This is only one of of a few. I swear there is local activity in the Delaware river. Unfortunately it disappeared as I pulled my camera out