The first legs will take place on April 26 with the second on May 3.
Atletico Madrid have confirmed that Diego Costa suffered a hamstring injury in Thursday's Europa League match against Sporting CP.
The tie will mark a first European semi-final in nine years for Arsenal and they will be hoping for another year of silverware success after a disappointing domestic campaign.
Kentucky governor 'guarantees' children sexually assaulted, poisoned due to school closures
The agendas from Kentucky arrived amid educator protests at Oklahoma and Arizona more than instruction funding and educator cover. The veto put Republican lawmakers in a tough position, asking them to vote a second time on a tax increase in an election year.
With Arsenal themselves likely to miss out on the top four, winning the competition is their best chance of playing Champions League football next season.
Diego Simeone's side are now second in LaLiga behind runaway leaders Barcelona.
Koke said he would give Jan Oblak a blank cheque to ensure he remains at Atlético Madrid after lauding the goalkeeper's performance in the Europa League. They are in first place in the Austrian Bundesliga, but the victor only gets a spot in the Champions League playoffs.
French club Marseille will play Red Bull Salzburg in the other semifinal.
Tom Bossert steps down as White House homeland security adviser
The Trump administration announced another major departure from its senior ranks on Tuesday, with the resignation of Thomas P. His departure came on the heels of a similar exit by NSC spokesman Michael Anton .
The Gunners came from 2-0 down to draw the second leg of their quarter-final at CSKA Moscow 2-2 on Thursday night, progressing 6-3 on aggregate against the Russian side. Meanwhile, their rival knocked out CSKA Moscow, Lazio, RB Leipzig to qualify for the current stage of the competition.
Now, this is a tournament that means much more to Arsenal, Marseille and Red Bull Salzburg when it comes to next season.
Extra incentive for Marseille - the final is in Lyon, France.
Los Angeles prosecutors reviewing sex crimes case against Kevin Spacey
Rapp said it happened in 1986, when he was at Spacey's home for a party, and Spacey put him on his bed and climbed on top of him. In England, Scotland Yard is investigating three separate sexual assault allegations against Spacey.