phnom penh cambodian prime minister hun sen wednesday renew criticism unite state week lead opposition figure flee country fear widen crackdown government critics ahead next year election hun sen rule cambodia 30 years show sign want relinquish power force closure several english-language media jail government critics include opposition leader kem sokha bomb recently discover nine sit southeastern svay rieng province drop unite state vietnam war hun sen say speech workers garment factories export output u.s. bomb drop cambodia belong unite state hun sen say late comment grow row accusations american agents conspire kem sokha overthrow government hun sen accuse unite state double standards say critical handle kem sokha case show respect human right cambodia drop bomb cambodia rank among world nations litter unexploded ordnance say mine advisory group help find destroy unexploded devices kill injure average two cambodians week u.s. embassy phnom penh immediately reply reuters request comment wednesday remark last week government file lawsuit demand dissolution opposition cambodia national rescue party cnrp move would help hun sen extend rule election party ready replace cnrp dissolve hun sen say wednesday add one party dissolve five party replace western countries condemn kem sokha arrest treason question whether election fair follow crackdown opposition leaders activists journalists u.s. ambassador cambodia william heidt last month reject government accusations u.s. interference urge release kem sokha face 30 years jail convict half cambodia opposition mps flee include outspoken deputy leader mu sochua leave last week hun sen former khmer rouge commander defect genocidal group help drive power 1979 ally china beijing say support cambodian government efforts maintain national security cambodia 's hun sen renew criticism unite state amid escalate row