A senior officer accepted police failed to have a contingency plan in place at Manchester Arena in the event of a major incident.
Chief Supt Allan Gregory, of British Transport Police, gave evidence at the public inquiry into the Manchester Arena terror attack.
Salman Abedi detonated a bomb in May 2017 at the end of an Ariana Grande concert, killing 22 people and injuring hundreds.
The hearing was told the arena was the UK’s only entertainment venue of such scale under the control of the transport police and Mr Gregory said there was no contingency plan in case of a major emergency.
When asked if this was an omission, he said: "In light of that awful event in May 2017, clearly that is a conclusion I would have to agree with."
He told the hearing that emergency services had failed to work together and said the local police force had failed to liaise with transport police.
Mr Gregory said he regretted not communicating with commanders of Greater Manchester Fire and Rescue Service and Greater Manchester Police.
"I should have been more diligent around reaching out and having conversations about what they understood," he said.
British Transport Police Chief Insp Tony Lodge told the inquiry that nearly an hour after the attack he was still trying to establish who had primary control.
Gold commander Robin Smith said better communication between emergency services was needed.
"Half the challenge is knowing who to ring and you are trying to ring the busiest people in the organisation," he said.
"The key thing is who you need to talk to."
Mr Smith suggested a WhatsApp group to aid communication.
"I think we could do that and I do not think it would be difficult. We can do better if we can communicate.
"That is what I would have enjoyed on the night."
During the inquiry, the emergency services were criticised for their slow response and relatives and survivors condemned delays in the treatment of victims and the evacuation.
The Manchester Arena Inquiry, set up by UK Home Secretary Priti Patel in October, is examining the circumstances of the attack and whether any opportunities to prevent it were missed.
Suicide bomber Abedi, 22, died as he detonated a rucksack bomb in a foyer.
His younger brother, Hashem Abedi, was convicted last year on 22 counts of murder, one of attempted murder and one of conspiracy to cause an explosion.
He was sentenced to jail for a minimum of 55 years.
Desert Warrior
Starring: Anthony Mackie, Aiysha Hart, Ben Kingsley
Director: Rupert Wyatt
Rating: 3/5
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The First Monday in May
Director: Andrew Rossi
Starring: Anna Wintour, Karl Lagerfeld, John Paul Gaultier, Rihanna
Three stars
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THE TWIN BIO
Their favourite city: Dubai
Their favourite food: Khaleeji
Their favourite past-time : walking on the beach
Their favorite quote: ‘we rise by lifting others’ by Robert Ingersoll
Dubai Bling season three
Cast: Loujain Adada, Zeina Khoury, Farhana Bodi, Ebraheem Al Samadi, Mona Kattan, and couples Safa & Fahad Siddiqui and DJ Bliss & Danya Mohammed
Rating: 1/5
SNAPSHOT
While Huawei did launch the first smartphone with a 50MP image sensor in its P40 series in 2020, Oppo in 2014 introduced the Find 7, which was capable of taking 50MP images: this was done using a combination of a 13MP sensor and software that resulted in shots seemingly taken from a 50MP camera.
COMPANY PROFILE
Initial investment: Undisclosed
Investment stage: Series A
Investors: Core42
Current number of staff: 47
RESULTS
Catchweight 82kg
Piotr Kuberski (POL) beat Ahmed Saeb (IRQ) by decision.
Women’s bantamweight
Corinne Laframboise (CAN) beat Cornelia Holm (SWE) by unanimous decision.
Welterweight
Omar Hussein (PAL) beat Vitalii Stoian (UKR) by unanimous decision.
Welterweight
Josh Togo (LEB) beat Ali Dyusenov (UZB) by unanimous decision.
Flyweight
Isaac Pimentel (BRA) beat Delfin Nawen (PHI) TKO round-3.
Catchweight 80kg
Seb Eubank (GBR) beat Emad Hanbali (SYR) KO round 1.
Lightweight
Mohammad Yahya (UAE) beat Ramadan Noaman (EGY) TKO round 2.
Lightweight
Alan Omer (GER) beat Reydon Romero (PHI) submission 1.
Welterweight
Juho Valamaa (FIN) beat Ahmed Labban (LEB) by unanimous decision.
Featherweight
Elias Boudegzdame (ALG) beat Austin Arnett (USA) by unanimous decision.
Super heavyweight
Maciej Sosnowski (POL) beat Ibrahim El Sawi (EGY) by submission round 1.
The five pillars of Islam
The specs: 2018 Nissan Altima
Price, base / as tested: Dh78,000 / Dh97,650
Engine: 2.5-litre in-line four-cylinder
Power: 182hp @ 6,000rpm
Torque: 244Nm @ 4,000rpm
Transmission: Continuously variable tranmission
Fuel consumption, combined: 7.6L / 100km