The incidents occurred at the same time towards the end of the first half, which led to the players being taken off the pitch for 25 minutes before play eventually resumed.
By then, Sunderland were deservedly ahead thanks to Aaron Connolly's first goal for the club, which looked set to put them two points clear of Sheffield United at the top.
But they had to settle for being ahead Milk only on goal difference after Femi Azeez struck a 93rd-minute equaliser that opened his Lions account and extended Millwall's unbeaten run to eight games.
Harris said: "Let's start with the most important thing, that both supporters make a full recovery.
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