Same style of large, pushing men did this to us on the metro in Athens they had an accomplice a woman who yelled at me for being pushed into her, trying to divert attention from the core robber group. I just loudly yelled that I was not going to be robbed and knew what they were doing. Unfortunately my husband was not fast enough to get the message and they took his brand new phone. But that was not in a zipped pocket of his travel shorts. He has learned.