ROYAL PALM BEACH — A 73-year-old man attacked an 81-year-old man with a pricing gun Sunday inside the Belvedere Road Wal-Mart, according to an arrest report.

Dennis O’Brien and John Esposito began arguing, and O’Brien swung at Esposito with the tool in his right hand, the report says. Esposito sustained a swollen left eye and cuts on his nose and mouth.

Esposito said he and O’Brien work at the Wal-Mart. He would not discuss the nature of their argument. Wal-Mart officials also would not comment.

O’Brien told a sheriff’s deputy he acted in self-defense, but security tape showed O’Brien raising his hand first, striking Esposito in the face and then pushing him to the ground, according to the report.

Officials booked O’Brien into the Palm Beach County Jail on aggravated battery charges. He was released Monday on $3,000 bond.