An 18-year-old is under arrest for allegedly setting a homeless man’s pants on fire on a subway train in Midtown.
Investigators say the 56-year-old victim was on a northbound No. 3 train when he was approached by the suspect at the 34th Street-Penn Station stop just after 3 a.m. Monday.
On Thursday, police announced Hiram Carrero was arrested and charged with attempted murder, assault, criminal mischief, arson and reckless endangerment…