An earthquake with a magnitude of 6.6 has struck South Asia, shaking buildings in Afghanistan, Pakistan and India, the US Geological Survey (USGS) says.
The USGS said the quake was centred about 40 kilometres west of Ashkasham in remote north-eastern Afghanistan, close to the border with Tajikistan and just across a narrow finger of land from Pakistan's north-western Chitral province.
Radio Australia reports it was measured at a depth of 210 kilometres and struck at about 2:58pm local time.
Residents left their homes in Kabul and Islamabad when the quake struck, with buildings swaying for more than a minute in both capitals.
Similar reports were received from across northern and central Pakistan and India.
In Pakistan's north-western frontier city of Peshawar, Khalid Khan, emergency director at the city's main Lady Reading Hospital, said three people were treated for "multiple injuries".
Media pictures showed two children who appeared to have been injured in the quake.
People in Lahore in Pakistan's east, 630 kilometres from the epicentre, also reported they had felt the tremors.
Witnesses in Chitral said the tremor was strong but there was no major damage visible.
A 7.5-magnitude quake struck the area on October 26 last year, killing more than 300 people and destroying thousands of homes.
In Kabul, Omar Mohammadi, a spokesman for the Afghanistan National Disaster Management Authority, said officials were collecting information but no reports of casualties or damage had been received so far.
Tremors were also felt in the Indian capital and in Kashmir, witnesses said, with some people working in high-rise buildings in the Indian capital rushing into the streets.
Reports have also surfaced of damaged housing and buildings throughout India.
The Delhi underground system was also halted briefly, commuters told the NDTV channel.
The Hindu Kush area bordering Pakistan and Afghanistan is a seismically active area, with quakes often felt across the region.
Just over a decade ago, a 7.6-magnitude quake in another part of northern Pakistan killed about 75,000 people.
Pic: AFP. An injured Pakistani boy cries as he arrives at a hospital in Peshawar.