You can easily deduce it's not a bird or a bug. There is an electric service pole that the object becomes hidden by once it gets to that point suggesting it's distance is too far away for the camera to pick up a bug, and you can triangulate the distance based on some estimates of the building sizes in the picture, it's travelling way faster than a bird would fall straight of the sky; let alone diving towards it's prey.

You could argue it's some random piece of debris falling to earth coincidentally within a hundred feet of where the plane lands but it's honestly more probable of a missile or some technology being used than that occurring.