Officials say transparency activist was interfering in U.S. presidential poll.
Deadly fights are common in Brazil's poorly resourced, overcrowded jails.
A landmark peace agreement, which was signed between the Colombian government and F.A.R.C. rebels last week, was rejected by the country's voters in a referendum held on Sunday.
President Manuel hopes deal would revive derailed economy & peace.
More than 220,000 killed and millions displaced by decades of bloodshed.
Deal will be subjected to referendum vote before it comes into force.
Violence erupted after two protesters killed in police firing earlier this week.
Inquiry alleges human rights abuse in a drug-related shootout last year.
Thousands of women hold strikes to protest growing sexual violence.
President appoints team to hold talks with opposition on modifying the deal.
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