Rep. Steve Scalise was shot Wednesday morning in Alexandria, Virginia, a House colleague told CNN, in what sources are calling an apparent "deliberate attack."
Rep. Mo Brooks said he was on deck at a practice for the congressional baseball team when the shooting occurred. Scalise, a member of the House Republican leadership as the majority whip, appeared to have been shot in the hip and it appeared two Capitol Hill police agents were shot, Brooks added.
According to both congressional and law enforcement sources, the shooting appears to be a "deliberate attack." Alexandria police said earlier Wednesday they were responding to a "multiple shooting" in the city.
The tweet also said the suspect is in custody "and not a threat." CNN has reached out to Capitol Hill police for details.
Brooks said there were a number of congressmen and congressional staffers lying on the ground, and at least one of them was wounded. The Alabama Republican said he used his belt as a tourniquet to help one of the victims.
He said the shooter appeared to be a white male but added that "I saw him for a second or two." He said the shooter was behind the third base dugout and didn't say anything.
"The gun was a semiautomatic," Brooks said. "It continued to fire at different people. You can imagine, all the people on the field scatter."
This story is breaking and will be updated.
CNN's Dana Bash and Peter Morris contributed to this report.