Hosts and kicks off World Cup 2014 against Croatia . Jennifer Lopez sings at opening ceremony . NEW : Brazil 's president Dilma Rousseff , mindful of the damage to the reputation of her country , has ordered a big security operation with a reported 150,000 soldiers and police deployed as well as 20,000 private security officers . Police fire shots at protesters in Sao Paulo . Spain is defending title from 2010 in South Africa .
Hosts and kicks off World Cup 2014 against Croatia . Jennifer Lopez sings at opening ceremony . NEW : Police fire shots at protesters in Sao Paulo . Spain is defending title from 2010 in South Africa .