iPhones and cash are the main targets of thieves who have started raiding people's tents as the 40th Glastonbury Festival gets underway.
Police have warned revellers to look after their valuables as there has been a rise in thefts.
Festival goers can ensure they are covered for any thefts if they make use of the personal belongings section of a home insurance policy, with the possessions of anyone who lives at the address permanently protected.
More than 100,000 revellers have set up camp for the weekend as the music begins on Friday.
On Thursday, nearly half of the 140,000 ticket holders were believed to have arrived after Michael Eavis opened the doors of his 900-acre farm in Pilton, Somerset.
The festival has been bathed in sunshine, but the glorious weather has been dampened slightly by an increase in crime.
Avon and Somerset Police have recorded more than 88 thefts from tents as at 5pm today - up on 47 from last year.
But the police said total crime was largely at the same level as in previous years with 116 crimes recorded on site this year, compared with 100 at the same time last year.
Sergeant Carolyn Crocker said: "Overall the statistics show that crime remains low and the festival remains a largely safe environment.
"However it's disappointing that a small minority feel the need to engage in criminal activity and spoil the event for others.
"We're continuing to work closely with security and stewards to educate festival-goers to the dangers of leaving valuables unattended in tents.
"At the moment it appears that iPhones and cash are the main targets for thieves and this is so easily preventable."
© Press Association 2010