UPDATE: A powerful earthquake has struck northern Afghanistan, with tremors felt in Pakistan and northern India.
At least 51 people are said to have been killed in Pakistan, with 19 deaths reported in Afghanistan.
The magnitude 7.5 quake was centred in the mountainous Hindu Kush region, 75km (46 miles) south of Faizabad, the US Geological Survey reported.
Buildings were evacuated in the capitals of all three countries and communications disrupted in many areas.
In the Afghan province of Takhar, a stampede at a girls' school triggered by the quake left 12 students dead, the provincial governor's spokesman told the BBC. Another 25 students were injured, Sunnatullah Timour said.
Seven people have been reported killed and 71 injured in the eastern Afghan province of Nangarhar.
In Pakistan, 28 people have been killed in the northern tribal areas, another 20 the north-west and three more in the Gilgit-Baltistan region, officials told AFP news agen