warned they may become the targets of gunmen. baltimore police revealing their own security scare, as two new york officers recover from being shot. we're breaking down the new threat to police officers and how they may be responding. dangerous cold weather across the country. millions facing this arctic chill that has already closed schools and cancelled flights. we're tracking what you need to know for this cold day. welcome back to "early start," everyone. i'm john berman. >> i'm christine romans. nice to see you this morning. 30 minutes past the hour. let's begin with this breaking news this morning. 11 days into the search for airasia flight 8501. part of the plane's tail section has now been found. divers fighting stormy seas and near zero visibility they have reached what is potentially a crucial turning point here. why is it so important? the black boxes in airbus a