Two more men have been arrested in connection with the death of a man allegedly attacked with a hammer.
Mr Jackson died in Hull Royal Infirmary
The arrests were made on the same day a 28-year-old man was remanded in custody after being charged with murder.
Barrie Jackson, 30, from Hull, suffered fatal head injuries outside the Dolphin public house in Greenwich Road, Hull, on Sunday night.
Two men will appear in court on 5 May charged with Mr Jackson's murder. Four more men are currently in custody.
Steven Gallant, 28, of Hull, appeared before city magistrates on Friday. He will appear at Hull Crown Court later with James Gilligan, 27, who is also charged with murder.
Mr Gilligan, from east Hull, appeared before city magistrates on Thursday.
The two men, aged 24 and 25, who were arrested on Friday are both from the east Hull area.
Detectives are continuing to question four other Hull men, aged 25, 34, 37, and 40, in connection with the incident.
On Friday, Det Supt Ray Higgins revealed a number of witnesses had still failed to come forward despite repeated appeals.
"The message is straight forward: If you were in the Dolphin public house on Greenwich Avenue before, during or after the attack or were in the street at that same time and if you haven't spoken to us yet, please simply pick up the phone and tell us who you are," he said.
"I think it's right to say to those witnesses, 'Be prepared to say why you haven't yet come forward'."