Organisers behind the Rio Games have apologised to spectators who are having to endure queuing in long lines to get access to the Olympic Park on the first full day of the Olympics.

Organising committee spokesman Mario Andrada said that "we obviously need to upgrade" the systems, and have asked security to speed up bag checks.

On Saturday, he said: "We apologise to everyone who is standing in the sun in lines outside the venues... we need to fix this in the next couple of hours."

There have also been reports of official buses getting lost, and Mr Andrada said that organisers would check to see if drivers had been trained sufficiently.

But, he said: "We don't have major structural problems with transport."