Attempts to rescue 10 men from a flooded mine in Mexico have been delayed after the water levels in three shafts rose suddenly on Sunday.
The miners became trapped on 3 August when a wall in a tunnel collapsed and water from an adjacent chamber gushed into the three shafts.
Officials say the water has to drop to a depth of 1.5m (5ft) to allow rescuers to enter the shafts safely.
But on Sunday, it suddenly rose again to more than 20m.
The governor of Coahuila state, where the coal mine is located, said the water was probably flowing into the shafts from a nearby disused mine. Governor Miguel Riquelme said engineers were trying to find the source of the leak so they can block it.
More than 200 million litres have been pumped from the shafts so far, but the rescue work has been hampered by a number of setbacks.
