So... I have lots of additional questions, but I'll let the NTSB handle it.
From this I'm thinking you assume it happened in New Jersey, USA. So I feel I should point out it's called New Jersey for a reason and the original Jersey (the location involved) is part of the British Isles.
fc101
Allegedly the pilots did notice a vibration on departure but didn't think anything of it as it stopped. Not sure on what part of the runway the pieces were found but it was after dark, previously mentioned that there were approximately 6 movements of varying a/c size before it was found.