Oliver Priddle and Niraj Amaidas received suspended sentences for attacking Cameron Devlin in 2019.
Officers stop a car in Worthing after receiving reports of threats to kill and criminal damage.
Sean Gray has been charged with the fatal stabbing of Adrian Horton and Uschi Schild in June.
Police say there have been several incidents across Sussex in recent weeks.
Sussex Police says the van driver died at the scene of the incident in Peacehaven on Wednesday.
A man from Bromley, is detained following an incident at the Port of Newhaven, Sussex Police say.
Officers are launching a murder investigation after a man and woman were found dead in St Leonards.
Sussex Police says the crash happened on Saturday morning on the A23 near Pease Pottage.
Toby Sousa, 33, of no fixed address, is due to appear before magistrates on Monday.
