MUST WATCH: Rep. Pelosi Reacts to Alexandria, VA Shooting That Injured Rep. Steve Scalise (FNN)

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WASHINGTON (AP) -- A top House Republican, Steve Scalise of Louisiana, was shot and wounded by a rifle-wielding gunman Wednesday at a congressional baseball practice just outside of Washington. Several other people were also wounded, and at least two were in critical condition.

Capitol Police officers who were in Scalise's security detail returned fire and wounded the shooter, who was taken into custody. In all, five people were taken to area hospitals, including the suspect, Alexandria police said.

Scalise, 51, the No. 3 House Republican leader first elected to the House in 2008, was in stable condition and undergoing surgery at a nearby hospital. He was shot in the hip, and his injuries were not life-threatening.

Two other people wounded were in critical condition at the George Washington University Hospital, a spokeswoman said, but the condition of the two others was not immediately known. Texas Rep. Roger Williams, who coaches the GOP team, said a member of his staff was shot and was receiving medical attention.

The gunman had a rifle and "a lot of ammo," said Sen. Jeff Flake of Arizona, who was at the practice.

President Donald Trump said he was "deeply saddened by this tragedy" and was monitoring developments. The House cancelled proceedings for the day.

The shocking event occurred at a popular park and baseball complex in Alexandria, Virginia, where Republican lawmakers and others were gathered for a morning practice about 7 a.m. They were in good spirits despite the heat and humidity as they prepared for the congressional baseball match that pits Republicans against Democrats. The popular annual face-off was scheduled for Thursday evening at Nationals Park across the Potomac River in Washington.

The team was taking batting practice when gunshots rang out and chaos erupted.

Scalise was fielding balls on second base when he was shot, according to lawmakers present, then dragged himself into the outfield to get away from the gunman.

Rep. Mo Brooks, an Alabama Republican, said his colleague "crawled into the outfield, leaving a trail of blood."

"We started giving him the liquids, I put pressure on his wound in his hip," Brooks said.

Texas Rep. Joe Barton, still in his baseball uniform, told reporters a shooter came out to the practice and opened fire, shooting at Rep. Trent Kelly, R-Miss., who plays third base.

"He shot at Steve Scalise, our second baseman. He hit Steve Scalise," Barton said, "Scalise's security detail and the Capitol Hill police immediately returned fire, and Alexandria Police also immediately came and began to return fire. They shot the shooter. The security detail saved a lot of lives because they attacked the shooter."