The BBC has asked the Tajik authorities to drop all charges against Usmonov.
The operation was considered to be a success with Ayombekov and his army surrendering themselves to Tajik authorities in August.
Tajik authorities advise sponsoring organizations in Tajikistan to submit their authorization requests at least two weeks in advance of the planned travel.
Tajik authorities explained the detentions and expulsions as part of a wider ongoing operation which also applied to Tajik citizens, not just refugees.
We are pleased that Tajik authorities have now considered our appeals.
However, remain vigilant in public places, and be alert to any security related announcements by the Tajik authorities.
Tajik authorities seek his extradition, alleging involvement in terrorism and arms offences as well as corruption.
We should use every channel available to appeal to the Tajik authorities to tackle this problem as quickly as possible.
One of the dead gunmen was a former Tajik border guard who had worked at the Lakkon checkpoint, Tajik authorities said.
So far there's no official response from the Tajik authorities.