Sad. Tragic. The story doesn't indicate if the 11-year-old couldn't understand the signs or didn't obey the signs or give any reason why he breached the fence. Perhaps he wanted a better look at something that caught his eye? Perhaps a breeze blew something of his to the other side of the fence? Who knows.
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But once the boy was in danger, the parents apparently made an heroic attempt to rescue him.....and all three died. Sad. Tragic.