UPDATE: As stated on the Key West Police arrest log, Nick Carter was arrested for one misdemeanor count of battery, touch or strike, at 8:13 p.m. No further details regarding the nature of the incident have been released.
Bail has not yet been set for Carter, and the singer is still in custody.
Nick Carter was arrested on Wednesday after allegedly getting into an altercation at a bar.
Authorities have confirmed to ET that an incident did occur at the bar, but cannot confirm that Carter was involved or detained. However, Carter's full name -- Nickolas Gene Carter -- does appear in the jail's inmate log in Key West.
The Hog's Breath Saloon declined to comment to ET.