Security chiefs were already on red alert last month as they used mirrors to sweep their team coach outside Manchester’s five-star Lowry Hotel.
Specialist security staff were caught by photographers carrying out bomb searched last 16th March – on the morning of their home Europa League 1-0 win over Russian side FC Rostov.
The highly-trained teams scanned underneath United’s £400,000 double-decker ‘Battle Bus’ before the players boarded for an 11am warm-up session.
Man Utd security swept for coach bombs WEEKS before atrocity
Looking back on what happened in Germany this week, it was clear they were anticipating or preparing for such a terror plot
Today United will again be on heightened terror alert as they jet to powder-keg Belgian city Brussels.
Jose Mourinho and his Old Trafford outfit are set to face Anderlecht on Thursday night in the Europa League quarter-finals.
An on-looker told how weeks before the terrifying blast in Germany that hit Borussia Dortmund’s team coach, United were already aware of the threat of team coach bombs.
One of the specialist security staff scanning underneath United's team bus Borussia Dortmund attack in pictures Tue, April 11, 2017
A football player has been injured after three bombs exploded near Borussia Dortmund's team bus ahead of a Champions League match against Monaco
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A view on the damaged windows of the Borussia Dortmund's team bus after it was hit by three explosions in Dortmund, Germany
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He said: “We were wondering what they were doing at first until it became apparent they were sweeping for magnetic bombs placed under the coach.
“They were very thorough and were not treating it as a joke – it was a serious matter.
“Looking back on what happened in Germany this week, it was clear they were anticipating or preparing for such a terror plot.”
Man Utd are set to play Anderlecht on Thursday Night in the Europa League quarter-final
United have used Wigan-based travel firm Eavesway for over a decade and hire a specifically designed luxury Van Hool TDX27 Astromega coach.
Last May the coach made headlines after being pelted by yobs outside West Ham’s former Upton Park stadium as they headed for a Premier League away match.
The vehicle carrying United’s squad, management team and a handful of club officials was under siege by missiles while making its way beside the ground.
The outer layer of the Astromega coach’s double-glazed windows buckled on persistent impact.
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The shatter-proof inner glass meant the players were not in danger when home supporters caused at least £1,200 damage.
Two or three security guards usually travel on board with the team and the bus – covered inside with a cream leather trim – comes with WiFi access, multi screen infotainment system with Sky TV and individual TV monitor for the players to make use of before and after matches.
The lower deck, which holds 16 people while the upper holds 29, has a kitchen equipped with Neff hot air ovens and refrigerators.
It is driven by the same man for the majority of United’s fixtures in the UK, while the club devise their own itineraries for away trips – from kit pick-ups, to lunches, to leaving for grounds.