RIO DE JANEIRO (AP) -- Competition is underway on the first full day of the Olympic Games, with table tennis, rowing, archery, cycling, water polo and fencing all taking place under a cloudless Rio de Janeiro sky and warm temperatures.

Traffic in parts of Rio quickly ground to a standstill as a cycling road race forced downtown roads to be closed. The race, including the world's top riders, started on Rio's famous Copacanbana beach and was due to be held over around six hours on Rio's roads and up steep hills into the mountains behind the city. Thousands of police and soldiers were patrolling the city.

Temperatures in Rio are forecast to vary between 22 and 31 degrees Celsius (72 and 88 degrees Fahrenheit) on Saturday.

Preliminary soccer games have already been played and more are due to be played on Saturday, along with rugby sevens, gymnastics, judo and swimming. Many of the events take place in the Olympic Park on Barra de Tijuca, a modern suburb to the west of Rio.