BOGOTA , Colombia ( CNN ) -- Colombian President Alvaro Uribe and leaders of a massive Indian protest plan to meet Sunday in the city of Cali . Protesters march this week along the Pan-American Highway in Villarrica , Colombia . The president spoke by phone Thursday evening with one protest leader , Daniel Pinacue , and said he looked forward to `` comprehensive and constructive '' dialogue , the Colombian government said . Tens of thousands of Indians are marching from the mountains of southwest Colombia to Cali , a city of 2 million , to demand more land , better education and health care and protection from corporations encroaching on their ancestral land . Colombia 's 1.3 million Indians rank among the most impoverished of the country 's 40 million people . Protesters and police have clashed since demonstrations began October 10 . At least four demonstrators have been killed and 130 wounded , Indian leaders said . They have accused government security forces of shooting at them . Watch as violence has marred the two-week-old struggle » . Authorities have denied the allegations and said some Indians have hurled rocks , thrown Molotov cocktails and homemade explosives at security forces . As many as 70 security force members , mainly riot police , have been hurt , the government has said . Authorities also said some Indians have shot fellow demonstrators to stir up the crowd 's anger . After initially denying such accusations , Uribe admitted Wednesday that police had fired on Indian demonstrators last week despite a government pledge that security forces would not do so . `` The police did fire , '' Uribe said at a news conference after CNN obtained and aired a videotape that shows police at La Maria Indian reservation October 16 in southwestern Colombia . Watch as Uribe apologizes » . The patrolman who fired , Uribe said , was being attacked with explosives . His supervisors did not know he fired , the president said . The Indians who have been killed died as a result of their explosives and not police bullets , Uribe said . `` This is a resistance movement , '' said protester Rodrigo Quira . `` We do n't agree with President Uribe 's policies , and other groups are affected , too . That 's why they 're joining us . '' The demonstrators have snaked along the Pan-American Highway , a major trade route in South America . They occasionally play traditional Indian songs that date to the time of the Spanish conquest , when many Indians across South and Central America died as a result of imported disease , slavery and warfare . `` I believe we have to forge strong alliances in our struggle to demand our rights , '' said Aida Quilcue , an Indian leader . A member of Colombia 's riot police force said , `` The Indians are the worst because they 're fighting with Molotov cocktails , gunpowder [ in homemade explosives ] and machetes . '' In the five-minute phone call between Uribe and Pinacue , the president said both sides should talk this weekend `` with a spirit of brotherhood , '' according to the Colombian government .
President Alvaro Uribe ready for `` constructive '' dialogue , government says . Indians demonstrating for greater land rights , protesting free-market capitalism . At least four protesters have been killed and 130 wounded , Indian leaders say . Authorities say protesters hurling rocks , Molotov cocktails at security forces .