Police say four masked men with machetes broke into the 23-year-old's Greenacre home.

Police say the victim had no links to organised crime and was targeted because of his family’s successful business.

Four men allegedly stormed the Greenacre property in the early hours of Saturday morning.

A man's arm was severed in a brutal home invasion in Sydney.

Police say four masked men with machetes broke into the 23-year-old's Greenacre home.