A small cargo crashed near the Chicago Executive Airport Tuesday shortly before landing, CNN reported. TV footage shows the plane broken into several pieces when it went down in a river. It is not known how many people were on board and whether they survived. Airport spokeswoman Laura Witlox said the plane went down around 2 p.m. after it was cleared for a visual approach, the Associated Press said, adding firemen are already at the site. The cargo plane was operated by a Michigan-based company called Royal Air Charter, AP said. 