Icelandic authorities now say threats of wildfires have officials on "high" alert and that eruption fissures were bigger than scientists initially thought after Wednesday's eruption of the once-dorman

As magma stirs beneath the surface, a notorious Icelandic volcano threatens to awaken once more, sending ripples of fear through nearby towns and retreats.

The eruption began early July 16 on the Sundhnúkur Crater Row, about 30 miles southwest from the capital, Reykjavik. See images of the eruption.