Knives, guns, even a gassed up chainsaws have all been found packed inside carry-ons at Pittsburgh International Airport.

Channel 11’s David Johnson got a first hand look at the items recovered by TSA agents and found a small but disturbing trend.

TSA Federal Security Director Joe Terrell set up two tables, with a small mountain of confiscated items that represent five weeks worth of seizures.

Terrell said they find knives every day, ranging from small pen knives to large blades.

Channel 11 also uncovered a small but disturbing trend. The number of guns found in carry-ons, is rising in recent months.

In 2010, nine guns were discovered at Pittsburgh International Airport, seven of them loaded. In 2011, the number dropped to seven, all loaded. So far in 2012, nine were detected, eight of them loaded.

The TSA says nationwide, the number of guns found at security check-ins is rising.

Security experts blame it on an increase in gun sales, and more right-to-carry laws across the country.

Terrell said in almost every case they’ve had here in Pittsburgh, passengers simply forget they packed them.

"Some folks you would expect to know better. Every once in a while, like a law enforcement officer, will forget it's there," Terrell said.

Terrell said TSA agents have seen it all.

"Some time ago we actually had a chain saw,” Terrel said. “It was actually gassed up. I think this is testimony that our system works."

If you’re found with a gun, Allegheny County police are called right away and you’re checked for the proper permits. You may be able to take it in checked bags to your destination.

Pennsylvania has rather liberal gun laws, but many states, like New York, don’t and if you have a gun in your carry-on, you can be taken to jail, officials said.