Via Erik Klemetti's Eruptions blog: Indonesian Eruption Update for February 11, 2014: Kelut and Sinabung. Click through for the full post and many links. Excerpt:
Another Indonesian volcano looks to be headed for new eruptive activity. The BPBD (Disaster Management) placed towns around Kelut (also known as Kelud) on their highest alert and the PVMBG (Volcano Monitoring) has the volcano at Orange, the second-highest alert possible.
This elevated status is due to a trio of signs: increased shallow earthquakes under the volcano, an inflation of the volcanic edifice and increasing temperatures of water in the crater of the volcano. These signs combined would all suggest that new magma is rising up under Kelut.
It has a history of fatal eruptions, with over 5,100 deaths during an eruption in 1919 and 34 deaths in 1990. Apparently, the local residents are taking this rumbling seriously — partially due to the warnings but also due to more colloquial beliefs about animal behavior prior to an eruption.