There was a lot wrong with the communication between the emergency services and the victims and the survivors of the bombing that night.
"She was speaking after the publication of a report by Lord Kerslake into the emergency services" handling of the attack in May past year.
The fire service's chief apologised "unreservedly" for the failures.
Lone suicide bomber Salman Abedi, 22, detonated his home-made device at 10.31pm on May 22 previous year in the arena foyer as 14,000 people, many of them children, streamed out at the end of an Ariana Grande concert.
According to the report, the first police officers were on the scene within one minute of the explosion, and more police and paramedics arrived soon after.
The report also said the fire officer was unable to get through to the force duty inspector.
One of the most startling revelations from the new report is that, because there was no clear and present fire in the venue following the explosion, the emergency responders didn't allow any fire crews to enter the building.
This hampered communication and awareness of what was happening at the scene.
"Strategic oversights" by police commanders led to confusion over whether there was an "active shooter" after the attack that killed 22 and poor communications meant fire crews only arrived two hours and six minutes after the bombing. Usually, its average response time is under six minutes.
The report said that a Greater Manchester Fire and Rescue Service senior fire officer "stuck to the rules" and kept firefighters 1,600 feet away from the scene while paramedics were already treating victims.
"There is not one single reason nor one individual that caused this failure".
Lord Kerslake said that "deep down" the errors were prompted by failings in "operational culture". Some said photographers took "sneaky" pictures through a window when they were being told their loved ones had died.
The inquiry panel said it was not able to determine whether quicker deployment of firefighters could have saved lives, saying only coroners can answer that. "The discipline of the fire service meant that they could not self-deploy".
But the National Mutual Aid Telephony system operated by Vodafone experienced a "catastrophic failure", Lord Kerslake found.
More positively, a number of families spoke in praise of sympathetic reporting by the Manchester Evening News and other papers local to the bereaved.
"This was clearly unacceptable and we sincerely apologize for the distress caused to those affected by this bad attack", Vodafone said in a statement sent to CNN.
However, Lord Kerslake said the company "should also apologise directly to the families" for whom the failure of this "vital" system "made the experience of this truly awful evening even worse".
Commissioned by Andy Burnham, mayor of Greater Manchester, the inquiry assessed the preparedness and emergency response to the attack.
But he assumed, wrongly, other agencies were aware.
"As a result firefighters themselves, desperate on the night to attend the incident, were let down by some of their senior colleagues". "We are working to make sure this never happens again".
The then £155,000-a-year chief fire officer, Peter O'Reilly, has now retired, keeping his pension with no action taken against him.
Police and ambulance personnel were on the scene "very rapidly" and emergency personnel exercised "sound judgement in an extremely stressful, chaotic and unsafe environment", the report added.
For example, while the survivors fled for their lives from the Manchester Arena after bearing witness to a terrorist attack, a homeless guy named Chris Parker robbed a bunch of them, and none of the police officers on the scene noticed or did anything about it. Justice would eventually be done, since he was sentenced to over four years in jail earlier this year, but that was eight months overdue.
The child of one family was given condolences on the doorstep before official notification of the death of her mother.
Lord Kerslake said the unspeakable attack had been a brutal and real-world test of the emergency services' response.
The civic response by staff at Manchester City Council has also been praised by Lord Kerslake as "exceptional", while voluntary, community and faith groups provided a vital role in supporting those affected.