A major police operation is underway in Southampton city centre following the suspected murder of a man in the early hours.

The Fareham resident, in his 40s, died of a cardiac arrest following a fight shortly before 12.40am this morning, police said.

Two Totton men, aged 35 and 60, have been arrested on suspicion of murder.

READ MORE: Southampton murder investigation launched after man dies - live updates

A large police cordon was set up in Bernard Street, which has shrunk down this afternoon to partially reopen the road.

Several police officers were on scene guard as detectives carrying out the investigation continued to gather evidence.

They are also questioning the two arrested men back at the police custody centre.

Here are our images from the scene showing the police activity.