Arsenal Wenger unhappy at Arsenal 'naivety'

Arsenal manager Arsene Wenger accused his side of being "naive" as they suffered their first Champions League defeat of the season, beaten at home by Borussia Dortmund.

Robert Lewandowski's late volley gave last season's beaten finalists a 2-1 victory at the Emirates.

Arsenal stay top of Group F level on six points with Dortmund and Napoli.

"We put ourselves on the back foot with the first goal and were naive for the second," Wenger said.

Gunners keeper Wojciech Szczesny had little to do in the match bar picking the ball out of the net,

Wenger said: "Look at how many saves our goalkeeper has had to make and we have conceded two goals.