Flights were suspended at Britain's Luton airport on Monday due to a runway defect discovered following high temperatures across the country.
"Following today's high temperatures, a surface defect was identified on the runway. Engineers were called immediately to site and repair works are currently in progress to resume operations as soon as possible," the airport said in a statement on Twitter.
The airport is used by airlines including EasyJet, Wizz Air, Ryanair and TUI.

Clinical trials begin for two potential Ebola treatments
Blast at Damascus cafe kills nine, wounds 20
Rebels in Indonesia's Papua kill American pilot, burn plane
Russian air strikes kill 10, injure more than 50 in Ukraine's Kyiv
Firefighters battle wildfire in southern France
US, Iran talks conclude in Doha, focused on Strait of Hormuz
Trump honours Theodore Roosevelt in North Dakota, debuts new Air Force One
Kenyan court charges 8 schoolgirls with fellow students' murder
