Police have released CCTV images of the Manchester bomber on the night of the arena attack.
It comes as fresh arrests and raids linked to the suicide bombing were carried out on Saturday.
The grieving father of a teenage victim of the Manchester bombing told a mother hugging her son: “Look after him - because you never know.”
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ITV News has obtained exclusive footage from inside the block where it is understood bomber Salman Abedi made his deadly device.
Behind the boarded up doors, the footage shows the site of a suspected bomb factory.
The 12th floor flat was rented by Salman Abedi for 12 weeks.
The GMB union has suggested the IT failure could have been avoided if the airline not outsourced its work to India.
The GMB said the disruption could have been avoided if the airline had not cut "hundreds of dedicated and loyal" IT staff and contracted the work to India in 2016.
A BA spokesman said: "We would never compromise the integrity and security of our IT systems.
"IT services are now provided globally by a range of suppliers and this is very common practice across all industries and the UK Government."
British Airways says it believes a "power supply issue" was the cause of a global IT failure that grounded scores of flights today.
It is feared that it could take days for services to return to normal and clear the backlog of passengers.
Chief executive Alex Cruz said: "We believe the root cause was a power supply issue and we have no evidence of any cyber attack."
British Airways has said it would be "happy to consider reimbursing reasonable expenses" to customers caught up in mass delays caused by a global IT crash.
In a letter to customers at Gatwick Airport, the airline said: "As part of our care obligations to our customers under EC Regulation 261/2004, we will be happy to consider reimbursing reasonable expenses for meals/refreshments and the provision of hotels, and transport to/from the hotel or other accommodation if an overnight stay is necessary based on the following guidelines:
The letter added: "Please accept our sincere apologies again for the disruption you have experienced today. We don't underestimate how inconvenient this is for you."
