Tensions are high in Rio with bomb disposal experts taking no chances with a suspicious package at the venue set to host the Olympic opening ceremony.
Host broadcaster Channel 7 revealed that a loud explosion had been heard in the famous Maracana Stadium early Sunday evening soon after a robot had been sent in following the detection of a suspicious package.
There were reports the package was a tool box.
"There was definitely an explosion after the robot went in," a Channel Seven spokesman confirmed.
Kitty Chiller in a media conference on Sunday said she is having continued meetings with Rio organisers about security issues including the theft of a laptop and three shirts during a fire evacuation.