Arsene Wenger says that Arsenal's 2-1 defeat at Bournemouth is "very frustrating" and admits he does not know how he men conceded twice to lose at Dean Court.
The Gunners took the lead through Hector Bellerin in the 52nd minute of the Premier League encounter, but then saw Callum Wilson peg them back 20 minutes from time.
Jordon Ibe then struck four minutes later to leave Arsenal reeling and mean that the Gunners have not now won in their last five matches in all competitions.
They are also five points off the top four spots, a gap that could grow larger following Liverpool's meeting with Manchester City at Anfield this afternoon.
Wenger has been left frustrated by the defeat, which he admits he did not see coming.
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The Arsenal boss told the BBC: "We were 1-0 up and suddenly we lost two goals and we don't know where they came from.
"It is very frustrating.
"Overall we have to look at it in a very objective and harsh way, we made mistakes we should not have made.
"The team that fights against relegation will fight and you cannot afford any concentration mistake", Wenger added.
Arsenal will now look to banish the disappointment of defeat at Bournemouth by beating Crystal Palace at the Emirates Stadium next weekend, a game which is followed by an EFL Cup semi-final second leg tie against Chelsea; the first leg ended 0-0 at Stamford Bridge.
