U.S. SEC has begun probe of cyber breach by SolarWinds - sources

FILE PHOTO: The SolarWinds logo is seen outside its headquarters in Austin, Texas, U.S., December 18, 2020. REUTERS/Sergio Flores/File Photo/File Photo/File Photo/File Photo

(Corrects this June 21st story to change sourcing)

WASHINGTON (Reuters) - The U.S. Securities and Exchange Commission has issued letters of investigation into a 2020 cyber hack involving information technology company SolarWinds, according to two sources familiar with the agency's investigation.