A phase of strong eruptive activity has started last night and is continuing with frequent explosions that eject incandescent bombs onto the upper outer slope and create a plume of gas and ash rising 3-4 km above the volcano to flight level 250 (25,000 ft).
During 2-3 June, the rate of emissions had climbed to 3-4 per hour, and volcanic earthquakes accompanied the rise of a new batch of magma. Strong tremor started last night, when activity became more vigorous.
There have been reports of a light ashfall in Amecameca Mexico State.
As of now, CENAPRED has not raised the alert level (but probably will do so soon), and keeps Yellow, Phase 2.
SOURCE: Volcano Discovery