DENVER — An Uber driver arrested in the fatal shooting of a passenger told a witness that he opened fire after his customer tried to attack him, police said Friday.

However, according to a partially redacted police report, Michael Andre Hancock, 29, declined to talk to investigators about the shooting on Interstate 25 just before 3 a.m. without a lawyer. Police said the unidentified man who was killed was found lying on the floor board of the car’s front passenger seat.