2 Maryland teenagers were among a group of thugs who robbed a 64-year-old man at gunpoint.The unidentified man was sitting on a park bench reading a book when the gang approached and attacked him. The youths stabbed the man, maced him, and filmed posted a video of the assault on Facebook.Police arrested Zannay Laws and Dakei Perry, both 18, and charged them with attempted murder and robbery.Police are looking for two other suspects.The Baltimore Sun reports that Laws filmed the attack on her cell phone while Perry and the others attacked the man. Afterwards, Laws posted the video on her Facebook page.The Baltimore Sun — One of the suspects placed a gun to his head, demanding money and property. Another stabbed him in his lower back, then a third sprayed him with Mace. Police say in charging documents that Laws was streaming video of the attack to Facebook.The victim was stabbed again, in the right arm, before the suspects fled with his iPhone, his North Face backpack and $60 in cash.Police spokesman T.J. Smith said a citizen tip helped lead police to the suspects, and suggested the Facebook posts were helpful to investigators.Laws was ordered held without bond Friday, while Perry was initially ordered held on $50,000 bond and a District Court judge ordered him held without bond at a bail review. Neither appears to have a prior criminal record. Attorneys were not yet listed in court records.