Updated 4:26 p.m. | Tickets to Thursday’s 56th annual Congressional Baseball Game were selling at a rate of 500 per hour, the morning after a gunman opened fire at the Republican team’s practice session.

More than 20,000 tickets had been sold as of 4 p.m. Thursday, the game’s organizers said. They have already raised more than $1 million.

Organizers said Thursday afternoon that it appeared they will not have walk-up sales available before the game and encouraged people to buy tickets online as soon as possible.

Last year, the game, which pits congressional Republicans against Democrats, raised $500,000 for its charities. Before Wednesday’s shooting, the game was on track to raise $650,000, according to Congressional Sports for Charity.

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