OLVESTON, Montserrat — The Soufriere Hills volcano, which has been erupting for the past 11 years, shot a cloud of ash more than 5 miles into the sky on Monday, and authorities warned that more significant activity is possible in coming days.

The blast, accompanied by increased seismic rumbling, released gases and steam from inside a lava dome that has grown rapidly over the last week, said Dr. Vicky Hards, director of the Montserrat Volcano Observatory.

"I think it was a warning call ... of what it can do," Hards said.

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