KEYPORT, N.J. (AP) — A New Jersey man whose number was found in the back pocket of one of the perpetrators of last week’s fatal attack on a Jewish market has been arrested for illegally possessing a weapon, federal authorities said.

Ahmed A-Hady, of Keyport, 35, was charged with being a felon in possession of a firearm, the U.S. attorney’s office said late Saturday. A-Hady hasn’t been charged with providing any of the weapons used in Tuesday’s bloody rampage in Jersey City.

David Anderson and Francine Graham killed Jersey City Police Det. Joseph Seals in a cemetery and then stormed a kosher supermarket, killing three people before being killed themselves after a lengthy shootout with police, authorities have said. Afterward, a note was found in Anderson’s pocket containing a telephone number and a Keyport address, according to authorities.

The number belonged to A-Hady, and the address was for a storefront for a pawnshop, officials said. Records indicated that A-Hady had bought two handguns in 2007 before being convicted of a felony in 2012 that made him ineligible to own firearms.

When authorities went to the pawnshop and interviewed A-Hady, he acknowledged still owning the weapons but denied that they were on the premises. But after receiving a tip about a safe, investigators searched the business and A-Hady’s home and found weapons including three AR-15-style assault rifles, three handguns and one shotgun as well as more than 400 rounds of ammunition, “including a large number of hollow point bullets.”