A Rio de Janeiro slum erupted in violence late Tuesday following the killing of a popular local figure, with angry residents starting fires and showering homemade explosives and glass bottles onto a busy avenue in the city’s main tourist zone.

Intense exchanges of gunfire were heard when members of an elite police force moved into the Pavao-Pavaozinho slum, which lies a few hundred yards from where Olympic swimming events are expected to take place in 2016. Residents blame police for the killing of the local man, whose body was found earlier in the day.

Police began an ambitious security programme in 2008 to drive the gangs from such slums and for the first time set up permanent posts. It is part of Rio’s overall security push ahead of the World Cup that begins this June and the Olympics the city will host.

In what has been a bad 48 hours for the country, Fifa’s top World Cup official visited the delayed stadium that will host the opener in less than two months and said there is “not a minute” to waste to get the venue ready.

Secretary-General Jerome Valcke said there’s still a lot of work to do at the Itaquerao stadium but stressed that it will be ready for the opening match between Brazil and Croatia on June 12.

He said local organisers are “running against time,” but they know there is “no choice” and understand they have to come through with their promise to finish all the work in time. There is only one

Fifa-scheduled test event planned for the stadium before the opener and it won’t even happen in front of a full crowd.

At the beginning of his latest tour of host cities, Valcke said there are “potential issues” with two other stadiums, one still being built in the southern city of Curitiba and the other in nearby Porto Alegre.

Valcke visited Curitiba later Tuesday and said there is “still lots to do inside and outside” the Arena da Baixada stadium. He was not happy that 27,000 seats were yet to be installed and said that it’s crucial the venue is finished in time for a test event on May 14.

“We have to make sure all is working on the 14th of May because there will be no other choice,” Valcke said.

The other stadium yet to be completed is the Arena Pantanal in the wetlands city of Cuiaba, where officials said Tuesday that the official inauguration will not happen this weekend as scheduled because of a delay in the delivery of some 5,000 seats. The venue’s opening should happen only in mid-May.