A year after Air India crash killed 260: Do we know what happened?

Friday marks one year since a deadly Air India Boeing crash , which killed 260 people in a densely populated suburb of the city of Ahmedabad in India’s western state of Gujarat. Families of those killed gathered at the site on Friday to mark the anniversary of the disaster, but they are still waiting for answers about what caused the plane to come down shortly after takeoff from the nearby airport. …