Police are appealing for information in connection with an alleged incident at the Pack Horse public house, Market Place, Bridlington between 1am and 2am on Saturday 14 September.
Two separate assaults are reported to have taken place between a 35-year-old man and a 26-year-old man. One of the men sustained a fractured eye socket and the other sustained a cut to his head which required a large number of stitches.
Police believe there was a large number of people in the pub at the time the incidents took place.
Anyone who may have information is asked to call Humberside Police tel 101 quoting crime reference 1997935.