A 1.7 magnitude earthquake caused the rumbling boom reported by dozens in Northeast Philadelphia late Friday, the U.S. Geological Survey said Saturday. No significant damage was reported.

The micro temblor - which some said could be felt as far away as Bensalem - struck just after 9:30 p.m. with an epicenter just blocks from Franklin Mills Mall.

While government seismologists originally said Friday than an earthquake wasn't to blame for the loud boom reported by residents near the intersection of Knights and Fairdale Roads, they revised their findings on their website Saturday.

Friday's quake is the second to hit the Philadelphia area this month. The survey recorded a 1.9 magnitude disturbance May 10 in Westampton Township.    - Jeremy Roebuck