A global IT outage is affecting major services including airlines, banks, healthcare and broadcasters across the world.
It is believed the meltdown is related to an issue at the software company Microsoft and global cybersecurity firm Crowdstrike - although it is unknown if it is the same problem is affecting airports and train services across the globe.
Microsoft said on Friday morning that it was continuing to address the "lingering impact" of its 365 applications and services that are in a "degraded state" while Crowdstrike said in an automated message that it was aware of reports of crashes.
Follow live: Major services across the world affected by outage
Here's what we know has been impacted so far. The list will be updated as we find out more.
Healthcare:
GP surgeries - many unable to book appointments or access patient records
Airports:
Heathrow - says flights are "operational" but the airport is "experiencing delays"
Luton - says airlines are affected and it is continuing with manual systems
London Gatwick - warning of delays but says passengers should still arrive at scheduled check-in time.
Manchester
Edinburgh airport
Stansted Airport
Berlin Airport in Germany
All Spanish Airports
Swissport - one of the world's biggest ground handling services for airports, check-ins, and baggage - has also been impacted.
Trains:
Avanti West Coast
Gatwick Express
Great Northern
Great Western Railway
Hull Trains
London Northwestern
Lumo Railway
Northern Railway
Southern Railway
Thameslink
TransPennine
West Midlands Rail
Airlines:
Today was expected to be the busiest day for flight departures, but the following airlines are impacted by the tech outage:
Ryanair
Delta Airlines
American Airlines
Virgin Australia
SpiceJet and Akasa Air (Both low-cost Indian airlines)
WizzAir
Ferry services
Port of Dover - people told to expect longer waiting times
Emergency Services:
911 lines in Alaska, Arizona, Indiana, Minnesota, New Hampshire, and Ohio
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Broadcasters:
Sky News UK
Sky Sports News
ABC News in Australia
NDTV News in India
Banks:
Bendigo Bank in Australia
Adelaide Bank in Australia
Supermarkets:
Coles Supermarkets in Australia
Financial:
London Stock Exchange News Platform (RNS)