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Featured Image Credit: Alamy & Fern Hawkins/Instagram
The Sun claim Cheshire police and sniffer dogs have been dispatched to Maguire's mansion, where he lives with fiancee Fern Hawkins and their two young daughters.
It comes after an email stated a bomb would be planted at the defender's property.
The threat is being taken as serious and Maguire and his family are believed to be extremely shocked.
A spokesperson for Maguire said: "In the last 24 hours, Harry has received a serious threat to his family home.
"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."
United have underwhelmed this season and are likely to miss out on next season's Champions League.
The Red Devils suffered a humiliating 4-0 defeat to bitter rivals Liverpool on Tuesday and they sit sixth in the Premier League.
As captain, Maguire is regularly criticised online and his performances have been called into question by supporters and pundits alike. It saw the 29-year-old hit back in a recent interview.
Speaking ahead of United's clash with Liverpool, Maguire explained: "I wouldn’t be playing every game for Manchester United in the starting eleven if I’d been playing bad every game or not playing well enough.
"There’s a reason why both managers [Ole Gunnar Solskjaer and Ralf Rangnick] have put me in the starting eleven every game.
"But I do also understand that I'm the captain of this club, I cost a lot of money, and when things aren't going too well and we're conceding goals, I'm going to get criticised."
Judgement of Maguire has spilled over to the England national team and he was booed by fans inside Wembley during last month's friendly against Ivory Coast.
Teammates came to his defence post-match as did manager Gareth Southgate, who slammed the boos as an 'absolute joke'.
Maguire joined United from Leicester City in 2019 for £80 million, a world record fee for a defender.
He was named captain the following January after Ashley Young moved to Inter Milan.
Since arriving, Maguire has played 142 times for United and scored seven goals.
United return to action on Saturday afternoon against Arsenal.
Erik ten Hag was announced as their new manager on Thursday and he'll take over at the end of this season.