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

An official said the eruption near Reykjavik, the 12th in four years from the same volcanic system, posed no threat to people or infrastructure.

New eruption in the Sundhnukur volcanic chain in Iceland: warnings raised due to tremors and risk of mudflows. Grindavík evacuated as the volcano continues to show signs of increasing instability.