The theft of oil company computers containing what the president called «state secrets» turned out to be a case of common robbery, police said Thursday according to The Associated Press. Police arrested four security guards at the port of Rio de Janeiro and recovered laptops and hard drives that were stolen from Petroleo Brasileiro SA earlier this month, federal police inspector Valdinho Jacinto Caetano said. The robbery of information about two major oil and gas finds reverberated at the highest levels of the government. President Luiz Inacio Lula da Silva described the lost data as «state secrets.» The stolen equipment contained data on Brazil's latest deep-water finds: The Tupi field in the Atlantic Ocean, which Petrobras says has much as 8 billion barrels of light crude, and the Jupiter field off the coast of Rio, which could be just as big.