A man threatened to kill a two-year-old boy and his mother after he was asked to stop swearing.
Police have now released a picture of a man they want to speak following the incident on a bus in Shoreham at 7.30pm on Wednesday June 5.
The mother and son were on the free shuttle bus between Coronation Gardens and Shoreham Beach when she asked a male passenger, who was shouting and swearing while on the phone, not to swear in front of her child.
The man then threatened to punch her son and to kill both of them during the incident.
He is described as white, in his mid 20s, with short blonde or light brown hair and lots of tattoos including a tribal tattoo on the left side of his face.
Anyone with information should call 101 quoting serial 1512 of 5 June.