Explosion in Istanbul, Turkey, leaves at least 6 dead

An explosion at a busy shopping area in Istanbul, Turkey, has left at least 6 dead and dozens wounded. Turkey's president is calling the incident a terrorist attack."CBS Weekend News" and "CBS Evening News with Norah O'Donnell" deliver the latest news and original reporting, and goes beyond the headlines with context and depth. Catch the "CBS Evening News" every weekday night at 6:30 p.m. ET on the CBS Television Network and at 10 p.m. ET on the CBS News app.