The images were taken from a number 50 bus in Thornton Heath at about 8.30pm on Sunday, before the incident at the Two Brewers bar in Clapham.

The men, in their 20s and 30s, were assaulted outside the south London venue and taken to hospital but have since been discharged.

Detective Chief Inspector Jivan Saivb said: "These images provide a clearer picture of the person we need to identify and locate following this shocking attack."

He urged people to look carefully and get in touch if they recognise the man.

The images come after a blurry photo of the suspect outside the bar was released by police on Tuesday.

In a statement on Instagram one of the victims - who showed his head in a bandage - said he was not sad or angry but had "so many questions".

The man, who goes by Aniello on his profile, added: "What can lead to changing a person's mind that much that they feel it's okay to attack anyone, whatever their reasons?"

The Two Brewers has thanked people for their "very kind messages of support and solidarity".

It added: "Our continuous thoughts are with the victims of this horrific attack.

"For now, it's business as usual. We won't let this cruel attack grind us down - let's keep spreading the love!"