Rio de Janeiro Games organizers have apologized to the spectators enduring long lines to access the Olympic Park on the first full day of competition.
Organizing committee spokesman Mario Andrada acknowledged that "we obviously need to upgrade" the systems and have asked authorities to speed up bag checks.
Andrada said Saturday that "we apologize to everyone who is standing in the sun in lines outside the venues ... we need to fix this in the next couple of hours."
Addressing questions about official buses getting lost, Andrada said organizers would check if drivers had sufficient training.
But Andrada says "we don't have major structural problems with transport."