A 17-year-old teenager in Philadelphia has been arrested in connection with a terrorism probe. The teenager, who has not been named due to his age, was taken into custody on Friday after authorities discovered that he had been buying and testing bomb-making materials in support of a foreign terrorist group. The FBI and Philadelphia law enforcement officials announced the arrest on Monday, revealing that the teenager had purchased chemicals, wiring, and tactical equipment associated with improvised explosive devices, and had conducted research on potential targets. It is alleged that the teenager was in contact with a Syrian group known as Katibat al Tawhid wal Jihad (KTJ), which has been designated as a foreign terrorist organization. Officials also stated that the suspect had access to firearms and had recently purchased items commonly used as remote detonators. The teenager is facing state charges including possessing weapons of mass destruction, conspiracy, arson, and causing or risking a catastrophe. The district attorney's office plans to prosecute him as an adult. The investigation is ongoing, and authorities have not disclosed any potential targets at this time.