Something set off 's alcohol-monitoring bracelet – and that set off a judge.
An arrest warrant was issued Tuesday for the actress by the same Los Angeles judge who earlier when Lohan failed to show up to court.
Superior Court Judge Marsha Revel found Lohan violated the terms of her bail and upped her bail to $200,000. A bond was later posted, sparing Lohan from being arrested until a hearing takes place next month.
A source close to the case tells PEOPLE the court-ordered alcohol-monitoring bracelet, called a SCRAM device, was Sunday evening during an MTV Movie Awards after-party.
District Attorney spokeswoman Jane Robison says the device was set off by "an alcohol-related violation." Lohan, 23, was fitted with the bracelet last month as part of her probation case after two DUI convictions.
On her Twitter page, Lohan denies being in violation of bail. "My scram wasn't set off," she writes in a series of full of misspellings, grammar errors and profanity.
"Its physically impossible considering I've nothing for it to go off – All of these false resports are absolutely wrong," she writes. "This is all because of FALSE accusation by tabloids & paparazzi & it is f------ digusting – I've been more than I'm compliance & feeling great."
• Reporting by KEN LEE
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