Root's finishes with 133 off 129 balls
Hales makes 95, Morgan unbeaten on 75
Tamim top-scores for Bangladesh (128)
Plunkett is England's best bowler (4-59)
Watch full highlights on BBC Two at 23:20 BST (UK only)
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
Did Sabbir take some pace off that? Hales got there far too early and that's why he hit it so square. You could see why he was eyeing that up, there was plenty of space to hit the boundary over the top.
He'll be frustrated not to reach 100 but you have to say well batted.
Hales c sub (Sunzamul Islam) b Sabbir 95
Ahhh he'll be gutted.
He wanted to reach triple figures in style.
He goes for a slog-sweep but doesn't connect as he wished. The sub fielder at deep midwicket held on.
Disappointing but a great innings nevertheless.
England need 306 runs to win
FOUR!
SIX!
Hales means business as a new bowler into the attack, Sabbir Rahman with his leg-breaks.
The first a short ball which Hales drags from the offside through to four. Then the second is massive, shimmy down the wicket, over the boundary rope for six. 100 is near.
Simon Mann
BBC Test Match Special commentator
Why don't we have substitutes in cricket? Every other sport does. In the Roses match recently Jimmy Anderson was injured after half an hour, clearly out of the game, and he couldn't continue.
Chris Woakes is injured after two overs today and is out.
England need 306 runs to win
Mustafizur continues, Hales with step to the right to get in line of the ball and with a big swing hits over to the leg side for a couple.
The 150 is up, the fastest 50 of England's innings so far.
Root looks okay for the moment, although his injury wasn't really tested in that over.
Jonathan Agnew
BBC Test Match Special
It's crazy and unkind that players are not allowed a runner. Here's Joe Root, at the start of the tournament, and he's hurt his hamstring. Does he go off and say he can't risk it getting worse? Or does he carry on going and risk putting himself out for the tournament. It's a real dilemma.
Root's having a long chat with the physio as he glugs down some drinks. TV replays show he may have twisted an ankle.
The physio is off and we continue, Root stays ... for now.
England need 306 runs to win
Root pulls one to deep square leg, for a moment it looks like it will find the fielder but falls safe.
Oh hold up, what's this? It looks like he has injured himself somehow whilst playing that shot.
Is it the hamstring? He's doing some stretches. Worrying sign for England.
Hales, down on one knee, whacks the final ball of the over down to long off for four.
But back to Root, the physio is on.
Roooooooooooooot! A half century for the Yorkshireman, showing why he is in the top 5 ODI batsmen in the world.
England need 306 runs to win
England need 168 from 150 balls. It's walking pace stuff for them, and maybe complacency is the only real worry. Alex Hales played a few ugly shots in the last over as he looked to speed things along somewhat.
The TVs' 'win predictor' says Bangladesh have a 77% chance of winning from here. Do they want to make it a bet?!
Halfway point.
Alex Hales with a contemptuous shot, skipping down to knock Shakib Al Hasan in to the stands.
#bbccricket
Steve Lawley: Leave Jason Roy alone. Secret weapon, once opposition get him out they think they have won.
Alex Dann: Roy is probably in the side because he averaged 50 last year. Same people probably called for Hales & Woakes to be dropped too.
Angus McPhail: I do agree that it might be time for Roy to be dropped, but he's out of form, not all of a sudden complete rubbish.
Andy Zaltzman
BBC Test Match Special statistician
Alex Hales and Joe Root average 72 when batting together, which is bettered only by South Africa's Hashim Amla and AB de Villiers.
England need 306 runs to win
Chance! Alex Hales calls a swift single and he has to slide in - no, well judged! He was clearly home before the ball flashed past the stumps.
Hales then pulls out of an attempted hook, he wants a wide for that bouncer, it was high!
Athar Ali Khan
Former Bangladesh all-rounder on BBC Test Match Special
It's difficult for the batsmen to pick up Mustafizur's cutters because he bowls it with the same action.
21-year-old Mustafizur Rahman is certainly one to watch. Every ball is a test.
Athar Ali Khan
Former Bangladesh all-rounder on BBC Test Match Special
England look in a good position but things can change very quickly. Bangladesh need to find a go-to bowler. They need to find someone to break this partnership. At the moment both batsman look solid and look to play shots.
Joe Root moved to 50 on the last ball of the last over, he's made it look all so straightforward. Can he and Alex Hales both pick up centuries here?
You can't see either of them getting out at the moment.
Hang on though - this Mustafizur Rahman is causing trouble! He teases a leading edge again from Hales and again it flies safe.
#bbccricket
Chiggers: Only just seen England cricket score as been in a meeting but can someone remind me why Jason Roy is in the side?
Martin Randall: Just leaving work. Will put TMS on for drive home. Cue collapse.
Alec Stewart
Ex-England captain on BBC Test Match Special
That's a strike that, he properly connected. Not too many people would hit near the dressing room.