A reward has been offered for a giant inflatable pig which floated into the Californian desert during a concert by ex-Pink Floyd star Roger Waters.

Organisers of the Coachella Festival have put up a $10,000 (£5,090) bounty, plus tickets for life, for its return.

The pig, which is the width of two buses, has a checked ballot box for US presidential hopeful Barack Obama painted on its underbelly.

Waters said “that’s my pig” as it drifted away during Sunday’s gig.

The animal’s flanks bear the slogans “fear builds walls” and “don’t be led to the slaughter”, with a cartoon of Uncle Sam holding two meat cleavers.

Coachella spokeswoman Marcee Rondan said: “It wasn’t really supposed to happen that way.

“People are putting search teams together to find this pig.

“But it may never be seen again,” she added, saying the inflatable was likely to lose air as its journey continued.

The pig was tethered to the ground with ropes and floated away as Waters was playing one of the versions of Pink Floyd song Pigs.

The group have used inflatable pigs during their concerts in the past, and the lost animal was the same prototype as all the others, according to Ms Rondan.

The festival are asking for anyone with any information about the pig to contact them on lostpig@coachella.com.