Three storm chasers were among the nine people killed in the most recent tornadoes to strike Oklahoma, CNN reports.
Tim Samaras, 55, and his 24-year-old son Paul died along with 45-year-old Carl Young whilst chasing a tornado in El Reno, relatives said.
Writing on Facebook, Jim Samaras confirmed that the trio had been killed:
Thank you to everyone for the condolences. It truly is sad that we lost my great brother Tim and his great son, Paul.
The men who died made a living from researching and recording extreme weather.
More top news
Temperatures recovering over the next few days.
An ambulance crew member told ITV News waiting outside hospitals to offload patients has become 'completely soul-destroying'.
Patrick Gunar was caught on CCTV attacking the girl on Cambridge Street in Pear Tree last month as she was returning from the local shop.