"Hijacked PCs may have helped drown out online chat about Russian election protests, say security experts.
The computers were used to disrupt Twitter as Russians chatted about ongoing protests in Moscow's Triumphal Square, said security firm Trend Micro.
Analysis of the many pro-Kremlin messages posted to some discussions suggested they were sent by machines.
Russian activists said thousands of Twitter accounts were being used to drown out genuine dissent.
BBC News - Russian Twitter political protests 'swamped by spam'