AlunaGeorge and Angel Haze pull out of Big Weekend
AlunaGeorge and Angel Haze have pulled out of Radio 1's Big Weekend because of flight disruptions.
It's after musicians, staff and DJs were delayed travelling to Londonderry after an emergency plane landing closed both runways at Heathrow.
AlunaGeorge tweeted that they were "gutted" they were not able to play at the three-day festival.
All three artists had been due to perform on Friday night on the Main and the 1Xtra/In New Music We Trust Stages.
A statement from the Radio 1 press office said: "Unfortunately due to the travel disruption affecting Heathrow we've had to cancel a few performances but we've still got an exciting line-up for our audiences."
Rudimental had previously decided not to play but are now performing.
Rita Ora, who is due to perform on Friday evening at the event in Derry, spoke to Newsbeat at the London airport.
"It's sad when a festival doesn't go to plan. It's annoying," she said.
"All I know is the acts aren't giving up so that's a good sign."
Four hours after their flight was due to take off, artists including AlunaGeorge and Angel Haze were still at Terminal 1.
Rita Ora described the terminal at Heathrow as a "Radio 1 reunion" as artists and stars from the station continued to look for an alternative route to Northern Ireland.
The airline said the Heathrow to Oslo service turned back after a technical fault before 9am. Witnesses reported seeing flames coming from one of the engines.
Other artists thought to be affected by the delays include J. Cole and Wiley, who are due on stage on Friday evening.
Rita Ora, who is headlining the 1Xtra Arena/In New Music We Trust Stage, says she is hopeful that she can still make it to the event in time to perform her set.
"Fingers crossed," she said. "I think Radio 1 will figure it out. You can't stop a show."
Calvin Harris, Biffy Clyro and Bruno Mars are headlining Big Weekend.
There's more information on BBC Radio 1's Big Weekend Derry-Londonderry website.
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