Michael McKenna doubled the visitors' lead before half-time
Arbroath extended their lead at the top of the Scottish Championship to three points with an empathic victory at struggling Dunfermline Athletic.
Rhys Breen scored a comical early own goal, sending Anton Dowds' cross into his own net while attempting to clear.
Michael McKenna - the division's top scorer - fired his 12th of the campaign into the top corner just before half-time and Dowds added a late third.
Dick Campbell's in-form part-timers are now 10 league games unbeaten.
They move clear of second-place Inverness Caledonian Thistle, who have a game in hand.
Dunfermline, winless in three matches, stay second bottom, a point above Morton.
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