The young men are on the roof of a solicitors office in Wrexham.
The firm says they have had to close their office due to the 'stand off', which otherwise has no connection to them.
It says the men have been there since midday on Wednesday, it is liaising with police, and hopes the situation is resolved as soon as possible.
A man who works locally has told ITV News there are a lot of police present in the area, trying to negotiate with the young men, who are throwing objects from the roof.
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Police carried out door-to-door enquiries.
The UEFA Champions League final in Cardiff this Saturday is billed as the biggest ever sporting event in the UK since the 2012 Olympics.
Cloudy with patchy rain or drizzle, possibly turning heavier for a time.