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.
More top news
Missed tonight's Adrian's Election Adventure? Catch up here
Showers will ease away to leave a dry night. Winds will become fairly strong, especially along the coast.
Celebrations will take place in Wales for the 70th anniversary of VE Day in Wales and we'd like to feature your memories and photos.