There have been reports that the gunman was shot and was in custody following the incident, which reportedly occurred after 7 a.m. at Alexandria Simpson Baseball Field. NBC News is reporting that as many as 50 shots were fired.
Scalise, the Republican Majority Whip, represents Louisiana. He was seen crawling into the outfield after being shot, NBC News is reporting.
There has been no word on the extent of the injuries to any of those involved.
The practice was being held before the annual Congressional baseball game scheduled to be played Thursday at the Washington Nationals' baseball park.
This is a developing story. Check back to Daily Voice for updates.
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