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Details are starting to emerge about Fiona Apple's arrest last night in Sierra Blanca, Texas, with the sheriff's office describing a "routine check of U.S. citizenship" of the people on Apple's tour bus uncovering the "presence of controlled substances."

"On September 19, 2012 at approximately 8 PM, a 2004 White and Blue Prevost tour bus traveling eastbound on I-10 approached the U.S. Border Patrol Checkpoint located in Sierra Blanca, Texas," Rusty Fleming, Public Information Officer of Hudspeth County Sheriff's Office, said in a statement. "During a routine check of U.S. citizenship [by] the inspecting Border Patrol agent, a canine detected the presence of concealed humans and/or controlled substances emitting from the inside of the vehicle and requested the driver to pull into the secondary inspection lane for further inspection.

"The agent requested all subjects to exit the bus so that a canine working the checkpoint could conduct an inspection of the vehicle. Upon entering the bus the canine alerted to a blue colored back-pack. A further search produced a glass container containing marijuana weighing 0.010 lbs. Also inside the glass container was a small plastic container holding a brown-clay-like substance that later tested positive for hashish. (Also weighing .010 lbs)"

Fleming said that Apple "freely admitted that the controlled substances belonged to her" and the singer was subsequently arrested and detained at Hudspeth County jail.

The singer posted a $10,000 bond today and was released. Apple was scheduled to play Moody Theater tonight in Austin and Bayou Music Center in Houston tomorrow. Raoul Hernandez, Music Editor at Austin Chronicle, tweeted, "Fiona Apple at the Moody Theater tonight is now officially postponed. Reschedule deets to follow from the venue 'shortly.'" An employee for Bayou Music Center told Fuse that Friday's concert was still scheduled to go on as planned.