Swedish police launched an investigation Thursday after fans of Stockholm side AIK did their best Thursday to disturb CSKA Moscow before a crucial match, with the Swedes making noise and setting off flares outside the Russian team's hotel, AIK said Thursday.
CSKA are in Stockholm to face AIK on Thursday in their Europa League playoff first-leg match.
Video of the incident, labeled "CSKA Moscow, good morning" shows a crowd whistling, sounding car horns and setting off fireworks and flares in front of the hotel shortly after 4 a.m. local time.
CSKA's Swedish midfielder Pontus Wernbloom told the local Aftonbladet newspaper that the team "woke up, but there was no danger."
AIK denied involvement and condemned the incident.
"At the moment we do not know who the people responsible for these actions are, but a police investigation has been started," a statement on the team website said.
"Moreover, AIK has set up an internal investigation to find out what AIK could have done to prevent things like this from happening. According to UEFA rules, AIK is responsible for the opposing team's safety."
In a separate incident, Spartak Moscow's website was offline much of Thursday, the club blaming "Turkish hackers" for the incident, following Spartak's 2-1 win over Fenerbahce on Tuesday in the first leg of their Champions League playoff tie.
Photos from the match show Spartak fans holding a picture of Mustafa Kemal Ataturk, the founder of modern Turkey and a revered figure for many Turks, upside down and reports that the image was later burned sparked anger among Fenerbahce fans.