Invenergy interview questions

I had a 30 minute phone interview, followed by an e-mail invite 48 hours later to a 4 hour interview with 4 different people. I Interviewed with 3 accounting managers which took approximately 2 1/2 hours. I felt that a group interview would have been quicker, especially since I was answering the same questions in each interview. The 3rd person that I interviewed with returned and informed me that "something came up" with the 4th person (Controller) and "I was asked to escort you out". No more details were given at that time, however I did receive the BEST "thank you but no thank you" letter 48 hours later and encouraging me to apply for other accounting positions.