The Gunners flung aside Swansea to go third in the Premier league, heaping pressure on other title challengers.
Swansea had matched the Gunners’ intensity early on but a loss of concentration allowed Giroud to turn in from close range after the returning Mesut Ozil’s header was not cleared.
Alex Iwobi killed any hopes of a comeback from the league’s bottom club after the break, the Nigeria winger forcing own goals in the space of 13 minutes from Jack Cork and Kyle Naughton.
Sanchez capitalised on some more poor defending to add a fourth for Arsenal that moves them above Liverpool – who face Manchester United on Sunday – and into third in the table, five points behind leaders Chelsea.
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