Claim: The avalanche caused the collapse of a steep glacier a kilometer above the towns below, which is thought to have briefly blocked a river, causing the water to back up.
Verdict: Partially True (60% confidence)
Explanation: According to BBC, the collapse of a glacier likely caused devastating floods in the Nepal-Tibet region, indicating that an avalanche led to the glacier's collapse. PBS reports that the glacier collapse temporarily dammed a river, causing water to back up, which supports the claim about the river blockage and water backup. However, none of the sources specifically confirm the glacier's collapse occurred exactly a kilometer above the towns, leaving this detail unverified. The verdict is partially ...