The arraignment for a South Florida man found with an enormous weapons cache in his home was postponed Monday while prosecutors seek a grand jury indictment.

The home of 20-year-old Calin Chi Wong was searched last month after authorities in Oregon discovered threats about a Virginia Tech-style massacre he made on the Internet. Wong had attended high school and college in Oregon.

Days later, police searched the home Wong shares with his parents in Homestead, Fla., and found a dozen guns and thousands of rounds of ammunition, including four AK-47 assault rifles, one sniper rifle with a scope, seven handguns, 7,000 rounds of ammunition and 132 ammunition magazines.

Wong's brother told FOX News that he was stocking up on weapons to sell them on the Internet.

The arraignment was rescheduled for May 6.

FOX News' Phil Keating and the Associated Press contributed to this report.