Liverpool taught Manchester United a solid footballing lesson on home turf, as they fell 5-0 to add pressure on manager Ole Gunnar Solskjaer.
Salah earned his second after being left alone to send a Jota pass wide of De Gea in a tumultuous finale to the half that saw Ronaldo and Fred yellow-carded.
Salah completed his hat-trick shortly after the break, before VAR disallowed Cristiano Ronaldo’s consolation goal for offside.
To worsen the result, Paul Pogba saw a straight red following a wild challenge after coming in as a second half substitute.
The midfielder was initially booked by referee Anthony Taylor but the official was asked to review the challenge on the pitchside monitor and changed his decision to a red card.
Keita was then taken off on a stretcher. By this time fans had already started leaving Old Trafford in droves, angered by the result. United went to a five-man defence when Diogo Dalot come on for Rashford after 62 minutes in a bid to survive the last half hour without further damage, but the match was already gone.
With this result, United now 8 points behind Liverpool. ManU fans have opined that it is only a matter of when rather than if Ole Gunnar Solksjaer will be sacked by the club