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
The parents of Dylan Seabridge, from Pembrokeshire, said they believed their son was suffering from growing pains.
A cold and windy day across Wales with sunny spells and showers of rain, sleet and snow
An inquest is to be held into the deaths of four family members who died when their car was involved in a crash near Aberystwyth in June.