Peru has declared a state of emergency in jungle areas where indigenous groups are blocking oil and gas installations in protest at a new land sale law.
The measure allows the authorities to send in troops and bans public gatherings for 30 days.
Some 65 Amazon tribes say the law will make it easier for big energy companies to buy up their land, parts of which are known to be rich in oil and gas.
They are angry at a law which they say makes it easier for investors to buy their land because it lowers the bar for consent from two-thirds of a community assembly to a simple majority.
The legislation is one of a number of laws being passed as part of Peru's free trade agreement with the US.