Example with a context (Did A UFO 'Not Made By Man' Hover Over Chile?):
The story unfolds in April 2013 when two photos emerge of an unusual disc-shaped object (seen below with close-up insert) over the Collahuasi copper mine in northern Chile. Several eyewitnesses watched as the UFO remained in the sky for over an hour, moving around and hovering.
Isn't there supposed to be an indefinite article in front of close-up insert? Did the author make a mistake or is this absolutely normal? What do you think?