A woman died Wednesday after being struck by a van in Brooklyn, and police sources say it was an unmarked police vehicle. It happened just after 6:00pm on Pennsylvania Avenue in East New York. According to sources, the woman was seen having a possible medical episode and collapsed in the street when she was hit by an unmarked police van. A witness who did not want to be identified says he was driving behind the van. Click here to read more on cbsnews.com.