But judging by the photographs it has posted on Instagram, they regularly discover extremely dangerous weapons - being concealed in a number of inventive ways. From knives disguised as keys and hidden within zimmer frames to a hand grenade found stuffed into a toy penguin.Recently, a Samurai sword was discovered in a carry-on bag at the Boston Logan International Airport and a knife was found under the insole of a shoe at Detroit Metropolitan Airport.After its annual review, the Transportation Security Administration (TSA) released a shocking list of weapons confiscated from passengers trying to board planes in the past year. The deadly haul of weapons included maces, fake suicide vests and an assortment of concealed guns and knives.Officers discovered the assortment of guns and knives as they screened 638,705,790 passengers at airports across the US. And criminals are coming up with more and more inventive ways to conceal weaponry. In 2012, a knife was discovered mounted to a walker at the Newark International Airport in New Jersey.(dailymail.co.uk)Bakudaily.az