At least four terror plots being planned by people living inside the U.S. have been averted.
Authorities are calling one of the plots the most significant terror threats against the U.S. since 9/11.
But the danger may not be over.
CBN News Terror Analyst Erick Stakelbeck appeared on Friday's The 700 Club to provide analyis of the situation. Click play to watch the interview.
In New York, 24-year-old Afghan immigrant Najibullah Zazi was charged with conspiracy to use weapons of mass destruction and more charges could follow in Denver.
In Springfield, Ill., 29-year-old Michael Finton was arrested after attempting to blow up a federal courthouse.
In Dallas, 19-year-old Hosam Husein Smadi was arrested after trying to blow up a skyscraper.
And in Quantico, Va., two North Carolina suspects remain under arrest for plotting to attack a Marine base.
"I think this is as close as we've come since 9/11 to having a major terrorist attack on U.S. Territory," former National Security Officer Richard Clarke said.
Intelligence officials have warned the next terror attack could be homegrown, and in Najibullah Zazi's case, his bomb making supplies came from unsuspecting places: beauty supply stores.
Officials say Zazi bought large quantities of hydrogen peroxide and acetone, a flammable material used to remove nail polish.
They're the supplies he needed for a homemade bomb recipe written by al-Qaeda.
"It's so readily available and it flies under the radar when you purchase it," Brad Garrett said.
In Illinois, Michael Finton, a man who idolized American Taliban soldier, John Walker Lindh, used a cell phone to try and detonate a bomb in front of a federal courthouse.
But the explosives were fake -- sold to him by undercover agents. Now the Muslim convert faces charges in the same building he tried to blow up.
"He talked about a number of different targets including the FBI building, the Decatur Police Department," said John Stafford with the FBI.
The foiled plot by Hosam Husein Smadi to blow up a 60-story office tower in Dallas was also an FBI sting.
"It's a crazy world and these are crazy times and there are a lot of crazy people out there," a Dallas resident said.
And although the plots were foiled, officials say the danger may not be over.
"I think until they find all the bombs and all the bomb-making materials, until they find everybody who was in the cell or willing to be in the cell, we still have a big problem," Clarke said.
Agents have some 20 subjects under 24-hour surveillance in an effort to continue foiling plots and prevent the murders America's enemies want to commit.