WASHINGTON (AP) - Wal-Mart, the nation's largest seller of firearms, is striking a deal with outspoken gun control advocate New York Mayor Michael Bloomberg on tighter standards for such sales.

Bloomberg is announcing the initiative Monday as he meets with Mayors Against Illegal Guns, a group he founded to try to crack down on the unlawful traffic in weapons that are often used in crimes.

Under the group's Responsible Firearms Retailer Partnership, Wal-Mart Stores Inc. (WMT) will agree to retain records of all sales in which guns are later found to be used in crimes, said mayoral spokesman Jason Post. The company will also conduct background checks on employees who handle guns.