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ALEXANDRIA, VA- Rep. Steve Scalise — as well as a congressional staffer and members of congressional police — was shot Wednesday morning in Alexandria, Virginia, in what sources are calling an apparent “deliberate attack.”

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, according to Rep. Mo Brooks, who told CNN he was on deck when the shooting occurred.

As of 9:45 a.m. ET, Scalise was in stable condition but undergoing surgery, per a statement from his office.

“Prior to entering surgery, the whip was in good spirits and spoke to his wife by phone,” the statement said. “He is grateful for the brave actions of U.S. Capitol Police, first responders and colleagues.”

The shooting took place at a practice for the GOP congressional baseball team.

In a statement, Texas Rep. Roger Williams, one of the team’s coaches, said one of his staff members was shot during the incident and is receiving medical attention. There was no information on the staffer’s injuries.

According to both congressional and law enforcement sources, the shooting appears to be a “deliberate attack.”

Two law enforcement sources told CNN the shooter, who is in police custody, has been taken to a hospital.

Members of Congress were practicing for a game that was scheduled for Thursday night at Nationals Park. It was not immediately clear whether it would go on as scheduled. The annual game has been played since 1909.

Lawmakers describe a chaotic scene

Lawmakers who spoke at the scene to reporters described a normal morning practice, at a field where they’ve practiced for years, when all of a sudden shots rang out. Lawmakers, staff members and even the young son of one of the members ran for cover, jumping into dugouts and over fences to avoid the gunshots.

Members described Scalise dragging himself roughly 15 yards away from second base, where he had been playing, and lying there until the shooter was neutralized, at which point some of them ran to assist him and apply pressure to the wound until he could be evacuated. Once they were able, Sen. Jeff Flake said he and Rep. Brad Wenstrup, who is a physician, went out to where Scalise was lying to apply pressure to the wound. Scalise was coherent the whole time, Flake said.

Kentucky Sen. Rand Paul told CNN “it would have been a massacre” without Capitol Hill Police.

“Nobody would have survived without the Capitol Hill police,” Paul said on CNN. “It would have been a massacre without them.”

“We had nothing but baseball bats to fight back against a rifle with,” Brooks said.

Arizona Sen. Jeff Flake added that he saw a member of Scalise’s security detail return fire on the gunman for what felt like 10 minutes, even though the police officer was wounded in the leg.

“50 (shots) would be an understatement, I’m quite sure,” Flake said when asked about the total amount of gunfire, including police returning fire.

Flake said two members of Scalise’s security detail were wounded, and another man was wounded in the chest.

Brooks 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, adding that he was sure it was a rifle but unsure what kind. “It continued to fire at different people. You can imagine, all the people on the field scatter.”

Trump tweets on the incident

The President is monitoring the situation, the White House said in a statement.

“The Vice President and I are aware of the shooting incident in Virginia and are monitoring developments closely,” President Donald Trump said in a statement. “We are deeply saddened by this tragedy. Our thoughts and prayers are with the members of Congress, their staffs, Capitol Police, first responders, and all others affected.”

Trump subsequently tweeted, “Rep. Steve Scalise of Louisiana, a true friend and patriot, was badly injured but will fully recover. Our thoughts and prayers are with him.”

House Speaker Paul Ryan and Republican Majority Leader Kevin McCarthy are safe on Capitol Hill and receiving updates, aides tell CNN. Neither was at the practice.

Scalise is the first member of Congress to be shot since former Arizona Rep. Gabby Giffords was shot in January 2011. Giffords was shot in the head by Jared Lee Loughner at a “Congress On Your Corner” event at a Tucson grocery store. Giffords, who authorities said was the main target of the shooting, survived the attack but six others were killed and an additional 12 were injured.

Loughner pleaded guilty in 2012 and was sentenced to life in prison without the possibility of parole.

This story is breaking and will be updated.

CNN’s Phil Mattingly, Dana Bash, Peter Morris and Noa Yadidi contributed to this report.

By Tal Kopan, Karl de Vries and Eugene Scott

CNN’s Phil Mattingly, Dana Bash, Peter Morris and Noa Yadidi contributed to this report.