With just four days left to prepare for the Olympics opening cermony in Rio de Janeiro, crews are beefing up security and working overtime on construction projects.
Security was extra tight Sunday as hundreds of athletes and members of the media arrived at Galeão International Airport.
"There was a very high number of Brazilian military officers at the airport carrying machine guns and in uniform," said NBC Bay Area reporter Jessica Aguirre. "There is also a lot of security as you leave the airport."
The International Olympic Committee said Sunday Rio de Janiero will deliver a successful games despite delays in preparations, budget troubles and political and economic turmoil in Brazil.
With less than a week to go until the Olympic flame is lit, crews were still putting finishing touches on the venues and working on transportation issues.
"We went past the main metro system, and it's working, but the passageway that leads to it is either under construction or not finished at all," Aguirre said.
Olympic organizers are also dealing with problems with some of the athletes accomodations, but on Sunday, members of the U.S. equestrian team said they had no complaints.
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"The accomodations have been great, and Team USA has a lot of people on the ground here to help us," said equestrian Lauren Kieffer. "But so far, everything is excellent."
U.S. volleyball player Carli Lloyd said she and her teammates worked hard to get to Rio, and are looking forward to competing.
"We know Brazil is an amazing country for volleyball, so were really excited to be here and to experience it with them," Lloyd said. "And hopefully with the fans too, and with all the people of Brazil."
On Sunday, there were still concerns about the health risks for Olympic athletes. A new study by the Associated Press found that Rio waterways are as filthy as ever, contaminated with raw human sewage. The contamination could affect rowers and open-water swimmers.
