Maroon and green smoke bombs were also thrown on the field before and during the first half of the Scottish Premiership game. Horgan scored again in the second half to give fifth-place Hibernian a 2-1 victory.
"It is the first time I have ever heard of a coconut being thrown on," Hearts manager Craig Levein said. "Who has got a spare coconut to throw on? Honestly, it is mental."
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