Ash Cloud spins around invisible shield UFO over Volcano Turrialba in Costa Rica - March 15, 2015

A webcam owned by the Costa Rican seismological and vulcanology institute (OVSICORI) and installed near the Turrialba volcano in Costa Rica during an eruption yesterday (March 15, 2015) captured several UFOs above and near the Volcano.

At 0.37 in the video you can see that a part of the ash cloud spins around a kind of invisible shield of a UFO. Then it looks like an unknown force pushes the ash cloud away from the object.