Four Republican congressmen were injured including one seriously injured -- Steve Scalise -- and the attack ended with police shooting the man, a 66-year-old Illinoisan who died later in medical care.
There were members of the public around the baseball field, but the attacker did not fire at them. He walked up and asked some people if the congressmen on the field were Republicans or Democrats before he began so shoot his rifle at them.
The FBI is seeking further information about the shooter. He is believed to have been politically active, a supporter of Bernie Sanders, and strongly anti-Trump.