A powerful 7.7-magnitude earthquake has struck in northern Afghanistan and was felt in a large area from northern Pakistan to India.
The US Geological Survey put the epicentre near Jarm in the country's northeast, 250 kilometres from the capital Kabul and at a depth of 213.5 km. 
Strong tremors were felt in New Delhi and Islamabad, residents told
Al Jazeera. 
At least four people died in Pakistan's Swat region and Charsadda districts of Khyber Pakhtunkhwa, including two women, sources told Al Jazeera's bureau in Islamabad.
In the Pakistani capital, walls swayed back and forth and people poured out of office buildings in a panic, reciting verses from the Quran.
Al Jazeera's Kamal Hyder, reporting from Islamabad, said it was too early to assess possible damage or casualties.
"Here in Islamabad, we were forced to leave our building and the tremors were also felt in Peshawar and elsewhere, as far as India and Afghanistan."
"The tremors continued for 30 to 40 seconds, which is alarming" our correspondent said. 
Vineet Gahlot, the director of seismology at the Indian Meteorological Department, said the earthquake had a magnitude of 7.7 and an epicenter deep in the Hindu Kush region of Afghanistan.