Around 10:18 p.m., people from the Rhode island line to North Chelmsford reported their lights flickered. Around the same time, people in Allston reported "a HUGE explosion" and "a massive flash of light in the sky."
BPD and BFD are investigating a report of a possible explosion at an NStar substation off Alcott Street in Allston.
UPDATE, 10:40 p.m.: BFD found no fire or evidence of explosions or giant, freshly opened cocoons at the substation, so departed.