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
Harvey Proctor spoke out after police investigating allegations of historical child sex abuse searched his home.
More than a 100 doors have cropped up at the base of the woodland - but managers say they are threatening the enchanted forest.
Jonny Evans and Papiss Cissé are facing likely bans from the FA after appearing to spit at each other during a Premier League game