A security guard who oversees a number of pubs in the area has told the BBC he saw four people stabbed by three attackers.
The man, who was deeply shocked and asked not to be named, said he was at the Market Porter pub when a colleague at another bar said there was a stabbing at the Borough Bistro pub nearby.
He said he went towards this pub and saw that "everybody started running" and there was screaming.
The eyewitness added that he saw three attackers, one of whom had a long knife and stabbing people, including a girl in her early 20s.