Arsenal remain top of the Premier League table following their 3-0 win over Swansea at the Liberty stadium.
After a goalless first half Mesut Özil setup Olivier Giroud with the opening goal on 49 minutes.
Koscielny doubled the Gunners lead on 68 minutes and Özil provided his second assist of the day setting up Joel Campbell with his first goal of the season.
Özil now has seven assists in his last five league games – the highest record in the league. The World Cup winner has a total of eight assists and two goals in all competitions this season.
Swansea v Arsenal
Kick-Off: 15:00 GMT
Swansea confirmed starting lineup: Fabianski; Naughton, Fernandez, Williams, Taylor; Shelvey, Ki; Montero, Sigurdsson, Ayew; Gomis
Manager: Gary Monk
Arsenal confirmed starting lineup: Cech; Bellerin, Mertesacker, Koscielny, Monreal; Joel Campbell, Coquelin; Cazorla, Ozil, Snachez; Giroud
Subs: Macey, Gabriel, Debuchy, Gibbs, Chambers, Flamini, Iwobi
Manager: Arsene Wenger
Goals: 49′ Giroud, 68′ Koscielny, 83′ Özil