LIMA  - Thousands of indigenous people across Peru late Wednesday agreed to a 48-hour truce in their 10 day protest against what they call "the law of the jungle" that opens up their Amazon tribal lands to development, officials said.

The agreement followed a meeting in Lima between Congress President Javier Velazquez and protest leader Alberto Pizango, who heads the Inter-Ethnic Association of the Peruvian Forest (Aidesup).

Velazquez said he promised to revise the controversial law in Congress on Friday.

Just before the agreement was struck, 11 people were injured in the northeastern Amazon city of Bagua when scores of natives armed with spears and stones attacked a local police station defended by some 500 police.

"There were 11 injured including natives and police officers in the clashes," Bagua health director Alejandro Falcon told the media.

On Sunday, clashes between 800 demonstrators and police left at least four people injured, prompting the government the following day to decree a state of emergency in the Amazon area.

Around 12,000 members of 65 tribes in Peru have been protesting since August 9 plans to open up development and land purchases in the region, which is estimated to contain billions of dollars' worth of timber, minerals and oil.

The tribes say the plans will force them to migrate from their traditional lands.

Congress on Tuesday took steps to resolve the dispute when its Committee of Andean, Amazon and African-Peruvian Peoples submitted a bill to revoke the "law of the jungle."

Welcomed by the protesters, the measure was quickly condemned by an angry President Alan Garcia, who on Wednesday said it would be "a very serious, historic mistake" to revoke the development law.

"If that were to happen out of fear of protesters, fear of unrest, Peru would someday remember it as the moment when change came to a halt and hundreds of thousands of people were condemned to poverty, exclusion and marginalization," he told reporters.

The Garcia administration contends the development law is aimed at improving the livelihood of indignous communities by developing their farming, livestock and mining activities so they can better integrate with the country's economy.

Indigenous leaders complain that they were never consulted on the law and that it really is intended to benefit the free trade agreement Peru has signed with the United States, to the detriment of native communities.

Aidesup said Peru's indigenous territories have been recognized not only by Peruvian law, but also by international treaties Peru has signed with the World Trade Organization that uphold the territories' ill-defined borders.