WASHINGTON (CNN) -- A Secret Service officer arrested a former NBA player after gunshots were reported just blocks from the White House early Wednesday morning.

Secret Service spokesman Eric Zahren said officers arrested the former Charlotte Bobcats player Lonny Baxter, 27, and his passenger Irvin Martin, 35, around 2:30 a.m. He said officers saw used shell casings in plain view and a handgun.

Zahren said it is unclear why the weapon was discharged and what the intended target was. The men were arrested for possession of a pistol without a license and for having unregistered ammunition and a firearm.

Zahren said a person flagged down the officer to report gunshots near the White House. The officer pulled Baxter and Irvin's SUV over on 17th and I streets and arrested the two men.

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