It looks like a typical tourist photo, as British Columbia woman Barbara Welsh and her friends smile near the foot of the famous Pyramid of the Moon at the Teotihuacan site northeast of Mexico City on Monday.
But in the background, clambering the pyramid's stairs, a man in a checked shirt can be seen, carrying something in his right hand.
Moments later, he pulled out a gun and started shooting, sending people tumbling down the pyramid.
Officials confirmed a Canadian woman was killed and at least 13 other visitors were hurt in the attack.
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