Middlesbrough boosted their play-off hopes with an emphatic win at Peterborough United, which dented the home side's Championship survival bid.
Posh had a shot cleared off the line before Marcus Tavernier's neat finish put Chris Wilder's side in front.
Close-range Folarin Balogun and Josh Coburn strikes followed in the second half, before Duncan Watmore rifled in a fourth for Chris Wilder's side.
Boro moved up to fifth in the table, while Peterborough sunk to the bottom, eight points from safety with just seven games left.
With Posh running out of games to try and stay in the division, they had to start well, and in-form striker Jonson-Clarke Harris drilled a shot narrowly wide early on.