Borussia Dortmund snatched a late goal at Atalanta to progress with a 1-1 draw, while AC Milan and Atletico Madrid, both with a three-goal lead from the away legs, completed the formality of qualifying with 1-0 wins at home on Thursday.

The evening was marred by the death of a policeman in Bilbao after rivals fans fought in the streets before the match between local side Athletic and Spartak Moscow, won 2-1 by the Russian team who still went out 4-3 on aggregate.

Arsenal had a three-goal lead from last week's win in Sweden but were rattled when Hosam Aiesh and Ken Sema scored twice in two minutes for Ostersund midway through the first half.

The North London side were spared further humiliation, though, after Ronald Mukiibi miscued when trying to clear a cross and defender Sead Kolasinac thumped the ball into the net from close range two minutes into the second half.

Napoli lost 3-1 in last week's first leg against Leipzig with a performance that embarrassed coach Maurizio Sarri, though he has emphasized that winning Serie A is the priority.

They restored some pride in the return as Piotr Zielinski scored from a rebound in the 33rd minute and Lorenzo Insigne turned in Jose Callejon's cross with five minutes to go.

That set up a rousing finale and Callejon could even have won the tie in stoppage time but his shot sailed over.

REUTERS