British swimmer Adam Peaty broke his own world record as he reached the 100m breaststroke final but there were no GB medals on day one of the Rio Olympics.

After a new best in the heats, Peaty qualified for Monday's final (02:53 BST) in the second-fastest time ever.

GB cyclists Chris Froome and Geraint Thomas, who suffered a late crash, missed out on medals in the men's road race won by Belgian Greg van Avermaet.

American shooter Ginny Thrasher, 19, won the first gold of the Games.

Two swimming golds helped Australia top the medal table, while there was drama elsewhere - with a controlled explosion on an unattended bag and a stray military bullet landing in a media tent.

Day two sees British cyclist Lizzie Armitstead - cleared to compete after appealing against a ban for missed drugs tests - in the women's road race (16:15). Peaty favourite for swimming gold

Peaty - the swimmer who was once frightened of water - scared his rivals with two blistering swims which make him firm favourite for the gold medal.

The 21-year-old clocked 57.55 seconds to break his own world record of 57.98, and then swam 57.62 to win his semi-final.

Hannah Miley narrowly missed claiming Britain's first medal of the Games, finishing fourth in the women's 400m individual medley as Hungary's Katinka Hosszu took the gold with a huge new world record of 4:26.36, over two seconds faster than the previous mark.

Max Litchfield was also fourth, in the men's 400m individual medley, while James Guy led at halfway in the 400m freestyle final, before fading to finish sixth.