The bus eventually pulled off as fans continued to yell abuse and make “jerk-off hand signals” at the family, she said.
She continued: “We’re just a family. We just wanted to support our team. I don’t understand - why wasn’t winning enough?
“My husband, who is actually American, was really angry, he told them they should be ashamed of themselves, that they were disgracing the English team. England’s team deserve better fans.”
The digital communications officer at a prestigious law firm said her son Henry had grown concerned for repercussions on Italy fans if England lose on Sunday.
“We’re hoping to persuade our kid to root for England on Sunday. One night of idiocy won’t undo 6 years of lovely friends and neighbours.
“I hope the police will put precautions in place for Sunday, outside of Wembley.
“As Henry said ‘Who’s warning the Italian kids?’”
A Met spokesman said they were investigating an allegation of an assault on Lordship Lane, East Dulwich on Wednesday July 7 at around 11.50pm.
“A passenger on a bus is alleged to have been punched by a man who was part of a crowd of people blocking the road.
“The victim did not sustain any lasting injuries and did not require hospital treatment.
“The incident was reported to police online in the early hours of Thursday, 8 July.”
The force added there was no record of a second assault and the confrontation happened in the doorway of a bus.