A small explosion took place at 05:49 UTC at Cleveland volcano, Alaska on May 5, 2018.
A small ash cloud was produced rising up to 6.7 km (22 000 feet) above sea level, drifting to the southeast.
A few small earthquakes were also recorded at the volcano during the previous several days.
In response to increased activity, the Alaska Volcano Observatory (AVO) raised the Aviation Color Code to Orange.
Explosions from Cleveland typically produce relatively small volcanic ash clouds that dissipate within hours; however, more significant ash emissions are possible.