He has reported this to the police who are now looking into the matter. "The safety of his family and those around him is obviously Harry's number one priority.
"He will continue to prepare for this weekend's fixture as normal and we will not be commenting in any further detail at this time."
The bomb scare is the latest issue for Maguire, who has been subjected to stinging criticism from pundits and jeers from England fans this season.
Maguire was part of the United team thrashed 4-0 at arch rivals Liverpool on Tuesday.