live on land containing gas deposits. The law stated that the 76 contracts signed by foreign firms must be renegotiated before 180 days. Protesters argued that the new law did not go far enough to protect the natural resources from exploitation by foreign corporations, demanding a complete nationalization of the gas and process in Bolivia. Due to the uncertainty over renegotiation of contracts, foreign firms have practically stopped investing in the gas sector. Foreign investment virtually came to a standstill in the second half of 2005. Shortages in supply – very similar to those observed in Argentina after the 2001 price-fixing – are deepening in diesel, LPG, and begin to be apparent in natural gas. The May–June social unrest affected the supply of hydrocarbons products to the internal market, principally LPG and natural gas to the occidental region. Brazil implemented a contingency plan – led by the Energy and Mines Minister – to mitigate any potential impact from gas export curtailment. Although the supply was never curtailed, the social unrest in Bolivia created a strong sensation that security of supply could not be guaranteed. Occasional social action has continued to affect the continuity of supply, especially valve-closing actions. Carlos Mesa's June 2005 resignation The protests Over 80,000 people participated in the May 2005 protests. Tens of thousands of people each day walked from El Alto to the capital La Paz, where protesters effectively shut down the city, bringing transportation to a halt through strikes and blockades, and engaging in street battles with police. The protestors demanded the nationalisation of the gas industry and reforms to give more power to the indigenous majority, who were mainly Aymaras from the impoverished highlands. They were pushed back by the police with tear gas and rubber bullets, while many of the miners involved in the protests came armed with dynamite. May 24, 2005 More than 10,000 Aymara peasant farmers from the twenty highland provinces came down from El Altos Ceja neighborhood into La Paz to protest. On May 31, 2005 residents of El Alto and the Aymara peasant farmers returned to La Paz. More than 50,000 people covered an area of nearly 100 square kilometers. The next day, the first regiment of the National Police decided, by consensus, not to repress the protests and were internally reprimanded by the government. On June 2, as the protests raged on, President Mesa announced two measures, designed