in addition to the bloodshed in osh, smaller-scale violence also broke out in bishkek, the country's capital. the violence came two months after an uprising brought a new government to power. in a televised address, the interim president said troublemakers were trying to undermine an upcoming constitutional vote. >> ( translated ): this situation causes deep concern. it is being fueled by different forces, including those who are interested in destabilizing the situation in kyrgyzstan and those who want to disrupt the upcoming referendum. >> sreenivasan: the government also dispatched troops to quell the violence. kyrgyzstan is home to the u.s. air transit base at manas, critical to ongoing operations in afghanistan. state department spokesman p.j. crowley spoke in washington. >> we have done our own checking, and report no american injuries or casualties at this point. we are obviously staying on top of that situation. meanwhile, we do continue to talk to the kyrgyz government about the transit center at manas. >> sreenivasan: there was no immediate word on what started the trouble