A 16-year-old US girl who went missing moments after tweeting that there was someone in her house is likely to have run away voluntarily, according to police.
Kara Alongi, from Clark, New Jersey, sent the tweet at 6pm on Sunday night local time (about 11am Monday NZDT) and has not been seen since.
"There is someone in my hour ecall 911," the tweet read (the spelling has not been corrected).
In the hours after her disappearance the hashtag #helpfindkara became a worldwide trending topic on Twitter and local police were flooded with an estimated 6,000 phone calls.
But authorities now say they are treating the case as a runaway juvenile and the mysterious tweet she sent is likely to be a hoax.
A taxi driver has confirmed that he picked up a woman matching Alongi's description at her address shortly after the tweet was sent.
He said he dropped her off at a nearby train station. It is not clear whether she boarded a train.
"We don't know why she sent (the tweet) out," Clark Police Chief Alan Scherb said.
"Right now we are not looking at any charges."
The rapid speed at which the case took hold on social media has drawn comparisons to #Kony2012, the hashtag made popular earlier this year in a bid to find Ugandan warlord Joseph Kony.
As Alongi's tweet went viral overnight, she gained more than 94,000 Twitter followers.
"I'm sure this will be a case study down the road," Mr Scherb said.