Democratic presidential candidate Martin O'Malley greets Iowans during the Central Iowa Democrats fall barbecue Nov. 15, 2015 at Iowa State University in Ames, Iowa.
Photo by Alex Wong/Getty

Politicians react on Twitter to San Bernardino shooting

Updated

Presidential candidates, members of Congress and other officials have already reacted on Twitter to the mass shooting that is still unfolding in San Bernardino, California.

Most have offered their thoughts and prayers to victims of the tragedy and their families and all three Democratic presidential candidates have issued calls to reduce gun violence.

California and Gun Violence

Politicians react on Twitter to San Bernardino shooting

Updated