Police and fire department officials were responding late Friday night to calls about an explosion of some kind in Northeast Philadelphia.

It's not an earthquake - that's what weather officials are saying about the reports of explosions, homes shaking and manhole covers being blow off.

Shortly before 10 p.m., emergency dispatchers were flooded with calls from residents near Knights and Fairdale Roads in the Far Northeast, reporting sounds of explosions. Fire crews responded, but found no signs of smoke or fire in the area, police said.

Responders requested help from the U.S. Geological Survey to determine if the disturbance was a minor tremor.

A spokesman for AccuWeather.com says the USGS reports no earthquakes in the Pennsylvania area.

Once emergency responders arrived on the scene, officials did not find any smoke or fire in the area. They are still at the scene investigating.