LAPD officers swarmed and handcuffed what they described as a "person of interest" in the Los Angeles arsonist spree that has left thousands of residents scared out of their wits for days. Fire officials say "it is too early to speculate" if this is the person responsible for the fires. Police have already released surveillance video showing the alleged suspect -- a ponytailed Steven Seagal lookalike (below). As you can see in our video ... the man in custody sports a ponytail Cops previously said 39 fires could be linked to the recent rash of arsons ... and another...