Tajik police have detained about a dozen protesters who rallied in front of the British Embassy in the Tajik capital, Dushanbe.
The protesters threw stones at the embassy building on June 10.
Some media reports say the protesters also smashed the embassy's security cameras and scuffled with security personnel.
The gathering was not sanctioned by city authorities.
Dushanbe police chief Said Jurahonov told RFE/RL on June 11 that all the protesters, whose goals and motives are not known, were brought to Ismoili Somoni district police.
Embassy officials confirmed to RFE/RL that the incident took place but refused to comment.
Meanwhile, media reports in Tajikistan say the activists may have been protesting British Ambassador Robin Ord-Smith's visit to Tajikistan's volatile eastern region of Gorno-Badakhshan, which started on June 11.