The killings took place in a penitentiary in Guayaquil, the South American country's largest city, the attorney general's office announced earlier on Friday. A seventh suspect, also Colombian, was shot and killed by police, while other suspects were later arrested. The second round run-off vote is scheduled for Oct. 15, the culmination of an election cycle marred by numerous incidents of violence. She has said that surging crime is unprecedented and that voters should not allow "terror" to stop them from voting for change. Reporting by Julia Symms Cobb; Editing by David Alire Garcia and Robert BirselOur Standards: The Thomson Reuters Trust Principles.

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Persons: Fernando Villavicencio, Ecuador's, Guillermo Lasso, Daniel Noboa, Luisa Gonzalez, Rafael Correa, Julia Symms Cobb, David Alire Garcia, Robert Birsel Organizations: American, Police, Thomson Locations: Guayaquil, Quito, Colombian