Millwall moved up to second in Cola-Cola League One with a 4-0 win at home to Gillingham as Swindon went down 3-0 at Colchester on Saturday afternoon.
Swindon dropped to fourth, two points behind the Lions, with Leeds climbing to third thanks to a 2-0 home success over Southend.
At the other end of the table, Stockport's 3-1 defeat to Yeovil saw them relegated to League Two.
Norwich's march towards the title suffered a slight stutter, meanwhile, as they needed an 89th-minute free-kick from Chris Martin to rescue a 1-1 draw against MK Dons. Aaron Wilbraham, who was sent off in conceding the foul which led to the equaliser, had given the Dons a 20th-minute lead at Carrow Road.
Millwall never looked in trouble once Shaun Batt had given them a 27th-minute lead against the Gills and further goals from Tony Craig, Danny Schofield and Neil Harris completed a convincing win.
Leeds claimed their second win of the week with a comfortable win over third-bottom Southend. Goals in the last half-hour from Max Gradel and Luciano Becchio gave Simon Grayson's men all three points.
Anthony Wordsworth scored twice in the second half following Ashley Vincent's opener as Colchester swept aside Swindon and moved level on points with sixth-placed Huddersfield, who went down 3-0 at Brentford. A Charlie MacDonald penalty in the 71st minute broke the deadlock at Griffin Park and the Bees raced clear with further goals from Lewis Grabban and MacDonald again.
Charlton remained fifth but slipped four points off the automatic promotion places with a 1-0 defeat at Southampton, for whom Michail Antonio was on target.
Stockport's fate was finally sealed as they fell 17 points from safety with five games left with defeat at home to Yeovil. Dean Bowditch and a brace from Gavin Williams put the visitors in complete control before George Donnelly's late consolation for County.
In the day's other games Wycombe beat Hartlepool 2-0, Leyton Orient drew 0-0 with Exeter, Tranmere were beaten 2-1 at Walsall, Carlisle won 2-1 at Brighton and Oldham beat Bristol Rovers 2-1.
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