How dangerous is Bali's Mount Agung and what action has been taken?

Worst possible scenario involves pyroclastic flows - currents of hot gas and rock moving at 70 miles per hour

Mount Agung, a volcano on the Indonesian island of Bali, has been in a state of unrest for several weeks and is now emitting smoke and ash. Mudflows, known as lahars, are running down the mountainside and loud booms have been heard. Experts say a large eruption could happen imminently.