NEW YORK CITY — Police are responding to reports of a possible explosion near the Port Authority bus terminal at 42nd Street and Eighth Avenue, New York Police Department Sgt. Brendan Ryan said Monday. The the A, C and E subway lines are being evacuated, he said. One person is in custody, according to two NYPD sources with direct knowledge of the situation. Francisco Ramirez said he heard two explosions as he was exiting a bus about 7:45 a.m. ET.