Monitoring stepped up at dangerous Iceland volcano

The Jokulsarlon glacial lagoon at the foot of the Oraefajokull volcano (David Keyton/AP)

Scientists have expressed concern about an increase in seismic activity at one of Iceland's most dangerous volcanoes.

The Oraefajokull volcano, dormant since its last eruption in 1727-1728, has seen a recent rise in seismic activity and geothermal water leakage that has worried scientists.