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A pair of masked men have been arrested in connection to the terrifying explosion at Harvard Medical School, authorities said. Logan David Patterson, 18, and Dominick Frank Cardoza, 20, were taken into custody Tuesday morning after they allegedly ignited a roman candle firework around 2.30am Saturday inside the building, according to FBI officials. The Massachusetts natives were visiting Wentworth Institute of Technology - about five minutes from the Ivy League's medical school - for Halloween weekend, witnesses said according to charging documents. They met up with friends at Wentworth and went to Cambridge that evening, but Patterson and Cardoza decided to stay out while everyone else headed back to the other campus, witnesses said. It was during their time out that the two men approached the Goldenson Building at Harvard Medical School, which they thought was 'abandoned,' lit a candle and placed a cherry bomb inside a locker, surveillance footage captured, per the charging documents. A cherry bomb is a sphere-shaped firework that creates a loud bang when it explodes. The explosion, which the Boston Fire Department said was intentional, went off on the fourth floor of the school - home to offices and labs associated with its neurobiology department. No one was injured, the FBI said. The suspects were then seen on camera 'visiting the fifth floor of the building' before fleeing out of the first-floor emergency exit and running in opposite directions, officials said. Investigators believe the explosive, a large commercial firework, went off inside a wooden locker on the fourth floor, the agency stated. One of the suspects was dressed in a brown hoodie, tan pants, white Crocs and donned a blue and gray balaclava over his face. The other had a blue mask on, dark hooded jacket, black sneakers and dark plaid pajama pants on, documents stated. About 30 minutes after the firework detonated Cardoza, of Bourne, was allegedly seen sitting on a bench, removing his pants and dumping them in a garbage can. The documents said Patterson was caught on camera around 3am running through Wentworth's campus. A bystander then let him into a building he was attempting to gain access to. Once inside, Patterson charged his phone near an attendant's desk and was allegedly seen talking on it, the press release said. Around 3.40am Paterson was seen exiting the building and meeting up with his alleged accomplice and an unidentified third person. The trio then walked around campus toward the Massachusetts College of Art and Design campus after 'unsuccessfully attempting to enter an adjoining residential campus building,' charging documents detailed. In that clip Patterson was allegedly seen removing his sweatshirt and sweatpants before stuffing the pants into his shorts. Cardoza was then spotted walking around in his boxer shorts, dark hoodie and black sneakers, documents stated. U.S. Attorney Leah B. Foley said the explosion created heightened worry and fear in the area. 'Anxiety levels naturally rise when the public learns that an explosion was intentionally caused. I would say those levels may rise even higher in the Boston area,' Foley said at a news conference, appearing to refer to the disastrous Boston Marathon bombings that left three dead in 2013. Ted Docks, the FBI's special agent in charge, echoed Foley's statement, adding that this was not 'some harmless college prank.' 'Let me be clear: Setting off an explosive device inside a locker at an institution geared toward higher education is not some harmless college prank. It’s selfish, it’s short-sighted, and it’s a federal crime,' Docks stated. The building did not sustain any structural damage and all equipment and labs remain intact, medical school officials said. No additional devices were found inside following a sweep of the building, police said. Patterson and Cardoza have each been charged with one count of conspiracy to damage, by means of explosive. Their motive remains unclear. Both of them are expected to appear in court later Tuesday. If found guilty, they could each face up to five years in prison, three years of supervised release and a fine up to $250,000, the agency said. The incident remains under investigation.
