Rock star Pete Doherty is being questioned today about allegations of assault and theft.
The former Libertines singer, is in custody at a north London police station after an alleged incident at a hotel in Islington.
Documentary maker Max Carlish claims he was attacked by Doherty at the hotel.
Mr Carlish, 38, who has filmed a documentary on the singer's new band Babyshambles, said he needed hospital treatment for two black eyes and a broken nose.
Doherty, 25, parted company with The Libertines after failing to curb his drug problems. He subsequently set up new band Babyshambles.
The self-confessed crack cocaine addict claimed to have spent nearly €1,500 a day in the past on his drug habit.
He was jailed for six months for burgling the house of Libertines bandmate Carl Barat in 2003.
Last September he received a four-month suspended jail sentence for possession of a flick knife.
The troubled star recently started a relationship with supermodel Kate Moss.
