A man was stabbed in the head by a knifeman wielding a meat cleaver on a busy shopping street, witnesses said.
Onlookers described dramatic scenes as the armed man ran down Kingsland Road, Dalston, waving the weapon and screaming at passers-by.
Police sealed off a section of the road, near Dalston Junction and Dalston Kingsland stations, as the victim in his 40s was rushed to hospital with head injuries.
A 32-year-old man was arrested on suspicion of GBH just after 3pm yesterday.
Journalist John Hall said he “genuinely thought it was a terror attack” after crowds of people began to run away from the armed man as he advanced down the street.
The 31-year-old was quoted in The Sun saying: “I kept on walking forward until I saw a man screaming and shouting a few feet in front of me.
“There was blood everywhere – pools of it all over the floor and up the walls of a nearby Ladbrokes.
“The man was storming up the road. Cars had to screech to a halt as he just walked out in front of them.
“It was really scary – people looked terrified. They were sprinting to get away.”