Football fans at Saturday's East Anglian derby have hurled beer cans and flares at Delia Smith's car as she arrived at the match.
She headed to Portman Road in Ipswich to watch the Canaries but was met with a hostile reception of blue flares and chanting.
One Ipswich fan attacked Delia's grey BMW by throwing a beer which landed on the bonnet and a flare was also stuck to the back windscreen.
The celebrity chef and husband Michael Wynn-Jones followed the home team bus to the stadium and the Portman Road car park was protected by a police escort.
Delia appeared shaken as she entered the Ipswich stadium.
Head coach David Wagner spoke about the incident during an interview.
He said: "Luckily she (Delia) is okay, unfortunately there are idiots all over the world.
"It does not get in my head how they can behave like this when a woman over 80 years old in a car drives to football match.
"It makes no sense - hopefully they will find the people and hopefully they will get banned for life."
Former sports journalist Mick Dennis, who is a friend of Delia, addressed the situation on Twitter.
He said: "Police instructed and arranged for her driver to follow ITFC coach to ground.
"They thought the alternatives, being part of convoy of NCFC coaches or her car alone, were less safe.
"Only one beer can was thrown at/onto the car.
"Delia and Michael had to scurry into ground, keeping heads down, but unperturbed.
"The bigger questions are why did the police allow groups of ITFC fans to wait either side of Princes St/Grafton Way junction with pyrotechnics to abuse and threaten all NCFC fans walking to the ground?
"Why no action when bottles thrown at NCFC players from Sir Alf Ramsey stand during the game?"
The match wrapped up with a 2-2 finish and Norwich's unbeaten derby day streak has remained intact.
The draw means Norwich haven't lost the derby in nearly 15 years, with Kieran McKenna's men set to travel to Carrow Road in April.
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