Pompey won at Shrewsbury to extend their advantage at the top of the League One table.
The 3-0 Shropshire success also ensured they stretched their run of victories without conceding to four games.
Abu Kamara hooked the ball home on the stroke of half-time after Marlon Pack's long throw caused chaos.
Pack extended the advantage for John Mousinho's men before Kamara rifled home his second of the afternoon late on.