Philadelphia ( CNN ) -- A 29-year-old man was arrested Thursday after screeners at the Philadelphia airport found flash powder and fireworks in his backpack , the Transportation Security Administration said . A federal criminal complaint accused Joseph Picklo of Dallas , Pennsylvania , of `` attempting to carry on an explosive device on a plane , '' according to the U.S. attorney 's office in Philadelphia . A bomb squad was dispatched to the scene , said Philadelphia police spokeswoman Christine O'Brien . But there was `` no early indication of terrorism , '' a federal law enforcement official said . Picklo was being screened for a United Airlines flight to San Francisco `` when a plastic bottle filled with an explosive substance was found in his luggage , '' the release from the U.S. attorney said . He was stopped by TSA screeners after `` it was determined that ( his ) carry-on bag contained several prohibited items including a water bottle filled with flash powder and M-80 fireworks , '' according to a TSA statement . Joe Sullivan , Philadelphia police counterterrorism inspector , said the plastic bottle was wrapped in black tape . The bomb squad responded in minutes and removed the material , which was being tested , Sullivan said . `` He said he was experimenting with the materials for a business he was starting . He said he forgot they were in his backpack . He told us he 's self-employed in sales , '' Sullivan said . Philadelphia police took Picklo into custody and he was later transferred to federal custody , the U.S. attorney 's office said . A federal defender was appointed to represent him at an initial court appearance Thursday afternoon . Picklo , who must still be formally charged by indictment or information , is scheduled to return to court Friday afternoon . The incident occurred before 6 a.m. at a TSA checkpoint serving terminals D and E , said Victoria Lupica , spokeswoman for Philadelphia International Airport . The checkpoint was closed immediately after the item was detected , and passengers were diverted to terminal C , she said . The checkpoint reopened at 6:18 a.m. , and normal airport operations resumed , she said . Aircraft operations were not affected , Lupica said . CNN 's Susan Candiotti and Chris Dignam contributed to this report .
NEW : Joseph Picklo allegedly tried to carry `` an explosive device on a plane '' TSA : Screeners find fireworks , flash powder in a man 's backpack . Federal official says there are no early indications of terrorism . Score: 6