HOMESTEAD, Fla. -- Nearly a year ago, 32 people were killed in the Virginia Tech massacre – the deadliest school shooting in U.S. history.

On Thursday, Homestead police said they wanted to avoid history repeating itself in South Florida by arresting an alleged gun enthusiast for threatening to re-create the Virginia Tech killings.

Police said they were shocked at the amount of weapons found inside Calin Chi Wong's home. They said he had more guns than most local SWAT teams.

"I've never seen firearms in possession by a citizen in that large amount, in that one concentrated area," Detective Antonio Aquino with Homestead police said.

Inside the 20-year-old's home, police discovered an arsenal of weapons, including four AK-47s, two sniper rifles and seven semiautomatic pistols.

Wong had 13 firearms in all, more than 5,000 rounds of ammunition, some that could pierce armor, and 100 rounds in a heating clip with bullets meant to take down aircraft or military machines. He'd hidden two AK-47s in his parents closet and his parents said the guns did not belong to them, Aquino said.

"There's also rounds that were in there, extremely large rounds that are enough to go up to 2 miles in radius," Aquino said. "It's enough to take down an aircraft."

Wong allegedly called police to go to his home. Police said the man was angry that he had been trying to purchase the weapons online and he said he had been ripped off.

Police in Oregon notified Homestead police that Wong had made threats in a chatroom conversation that he wanted to copy the attacks at Virginia Tech.

"It's extremely scary to all of us, to the entire police department," Aquino said. "That's why we take it very seriously."

In the conversation, Wong mentioned the shooter from Virginia Tech.

"As we all know, around a year ago this guy named Cho shot up Virginia Tech because no one believed him," Wong said in the chatroom. "I'm soon to the point to reenact the whole event if this doesn't get squared away soon."

Aquino said Wong is extremely knowledgeable about the firearms.

"He knew the makes, the models," he said. "He knew what kind of fire power they were. He even went on listing the dates of purchase and how much."

At the Wong family business, China King, no one had any comment, including Wong.

Police said his parents may have ignored some crucial warning signs.

"He had remembered him saying that he was going to shoot and kill people," Aquino said. "He was thinking that his son was a good kid, but he was just upset because of what happened with the loss of the money over this firearm transaction."

Wong was charged with making written threats to kill or do bodily injury via the computer and bonded out for $7,500. Additional charges are pending, he said. A telephone listing for Wong could not be found. It was not immediately clear if he had a lawyer listed.

The charges against him were for making threats, which is a second-degree felony and not strong enough to hold him without bond, police said.

Authorities said Wong had to be released on bond unless the state specifically requested that he be held until trial.

Wong felt isolated and cut off, authorities said. He'd been buying and selling guns for about two years and now word was getting around about Wong's age. Dealers stopped selling to him and he was being banned from certain gun-sale web sites.

Wong told police making the threat made him feel good because after "he had thousands of people on the Internet paying attention to him," Aquino said.

Wong told police he was just upset and frustrated and never actually planned a killing spree.

But authorities also found a school book bag lined with bullet proof vests and two handguns inside Wong's home.

Wong is not enrolled in college. He graduated from an Oregon high school and attended college for a year before moving in with his parents in Florida, authorities said.

Wong said the weapons were an investment.

"He says it's a lucrative business," Aquino said. "He said if Hillary Clinton wins she'll put a ban on assault rifles and these assault rifles will be worth more in value."

Police said they'll continue to investigate what he intended to do with the weapons.