What was that airplane?

Two weeks ago I was down in NJ visiting the inlaws. They live in
Cedar Grove, and there is normally a LOT of airplane activity overhead
from Kennedy, Laquardia and Newark, beside Caldwell and a few other
airports nearby.

While I was sitting out on the back deck enjoying the sunshine and
warm temperatures I heard an unusual sounding engine noise. I looked
up and saw a sleek white airplane buzz by with what appeared to be two
turboprops mounted on pylons off the rear of the fuselage. I couldn't
tell for sure but I assumed that the buzzing sound was a result of the
props being at the rear of the pylons. It was moving quickly and I
only got a glimps of it.

Anybody know that that was?

Thanks, Corky Scott