T in the Park fans watch Scottish DJ Calvin Harris on Friday evening
Five people have been arrested and ejected from the T in the Park music festival for possessing or using pyrotechnic flares.
Police said organisers had made it clear that flares, smoke canisters and smoke pellets would not be tolerated at the event.
Organisers DF Concerts said its priority was to keep people safe.
About 85,000 people are attending T in the Park, which is taking place at Balado near Kinross until Sunday night.
Rihanna headlines the main stage on Saturday.
She has a crew of 90 and her set-up has been transported in seven articulated lorries, compared with the standard two or three, according to event organisers.
Other musical tastes will be catered for throughout the day by the likes of Frightened Rabbit, Travis and Richie Hawtin.
Oasis offshoot Beady Eye head up the Radio 1 Stage and Mercury Prize winners Alt-J will close King Tut’s Wah Wah Hut tent.
In contrast to the muddy conditions of last year, festival-goers were again treated to pleasant temperatures, although not quite as warm as Friday.
Friday’s soaring temperatures contributed towards the number of first aid incidents almost doubling in comparison to 2012 with sunburn being the most common complaint, according to organisers.