Geneva - Environment experts are monitoring closely 18 lakes that have formed following the earthquake in China, a UN spokesman said Tuesday.
They had been created by debris blocking the rivers the Office for the Coordination of Humanitarian Affairs (OCHA) told journalists in Geneva.
"These lakes could create a potential danger for the populations below if the rivers burst through once more," warned OCHA spokeswoman Elisabeth Byrs.
The threat was even greater with further aftershocks being forecast in the region.