At least 30 people were killed in a car bombing in Afghanistan, local officials say.
The bomb went off late on Friday close to a guesthouse where the students were reportedly staying in Pul-e-Alam, the capital of eastern Logar province.
Dozens of people were hurt. Witnesses described roofs collapsing and victims being trapped under the debris.
No group has said it was behind the blast as people broke their fast in the Islamic holy month of Ramadan.
Some of those killed were high school students preparing to sit university entrance exams, said Hasibullah Stanekzai, head of Logar’s provincial council.
As many as 90 people were injured, interior ministry spokesman Tariq Arian said.
He said the explosion caused widespread damage in the area, including to a hospital and residential houses.
“The roofs of houses have collapsed and people are trapped under the debris,” he said.
“The security forces are trying to rescue those trapped.”
The British embassy in Kabul condemned the attack, saying “this senseless violence against civilians must stop”.
The blast came a day before the US military formally begins to withdraw its remaining troops from Afghanistan.
President Biden announced earlier this month that all American troops would leave Afghanistan by the 20th anniversary of the 11 September 2001 attacks in the US.
This decision angered the Taliban who had signed a deal with previous US President Donald Trump agreeing all troops would leave the country by 1 May if the militants upheld the deal.
The country has seen a rise in militant violence in recent months, including an increase in civilian casualties.