The Mail on Sunday says Gerrard was practising free-kicks ahead of tomorrowâ€™s Premier League clash against Swansea at the Liberty Stadium and initially ignored the unnamed man, whose hands were covered in anti-vandal paint after he climbed the perimeter barrier.
Gerrard continued to strike kicks at goalkeeper Simon Mignolet as part of an exercise with team-mate Philippe Coutinho until the abuse became personal. One eyewitness said the man shouted at Gerrard: "I know where you live, you p***k" and "Iâ€™ll burn your f***ing house down".
Liverpool assistant manager Colin Pascoe prevented Gerrard from going near the man and kit manager Lee Radcliffe ran from the pitch to go outside and confront the abuser.
As Radcliffe got closer, the man rode away on a bicycle with a parting shot aimed at Gerrard. "Iâ€™ll kill you and your kids," he yelled.
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