FBI Looks for Link Between Boston Bombings, 3rd Man Daniel Morley arrested in June after threatening to blow up plane By Evann Gastaldo, Newser Staff Posted Jul 16, 2013 7:56 AM CDT 7 comments Comments This image from a FBI and Homeland Security joint bulletin issued to law enforcement and obtained by the AP shows the remains of a pressure cooker that the FBI says was part of a Boston Marathon bomb. (AP Photo/FBI) (Newser) – A man who was arrested June 9 in the Boston area had the necessary materials for building a pressure-cooker bomb like the kind used in the marathon attacks, according to recently unsealed police documents. And according to Daniel Morley's mother, he'd had the materials prior to the April marathon bombings. Now the FBI is investigating him and any possible links between the two cases, Reuters reports. Wicked Local reports that the 27-year-old was taken into custody after police responded to a domestic disturbance; Reuters reports he allegedly assaulted his mother and her boyfriend and threatened to blow up a plane. After Morley's arrest, police found weapons including an assault rifle and a handgun, a pressure cooker and other bomb materials, several hundred rounds of ammo, a black duffel bag, and some even weirder items (a bird's head in a shoebox, a burned and stabbed stuffed animal, a drawing of what appears to be the Boston skyline and a plane) in his home. Morley's mother also said her son told her that his best friend boasted of knowing Tamerlan Tsarnaev. And according to the affidavit, that friend "was attempting to have him do something really bad, but Daniel did not want to do," or so Morley told his mother. Morley is currently at a state hospital undergoing psychiatric evaluation.