An Afghan family who refused to give their daughter in marriage to a man they considered irresponsible were attacked at home by gunmen who beat the father and then poured acid over both parents and three children, officials said on Wednesday.
Eighteen-year-old Mumtaz, the oldest daughter, had been pursued by a local gunman who the family considered a troublemaker and bully.
With her parents' support, she turned him down and instead got engaged to a relative.
A few weeks later, six or seven armed men burst into their home in the Bulk Awal area of the northern Kunduz city - the largest in the region - in the middle of the night.
"First they beat her father and then they attacked with acid," said Mumtaz's mother, who asked not to be identified.
All five are now receiving medical treatment, said Abdul Shokor Rahimi, head of the Kunduz regional hospital.
"The father and oldest daughter are in critical condition as they have been attacked all over the body," Dr Rahimi said.
"Their mother and two daughters who are 14 and 13 have some wounds only in hands and faces."
Ghulam Mohammad Farhad, the senior police detective for Kunduz, promised to track down the attackers, who he called immoral and irresponsible.
"We have started an investigation and those who have attacked them will be prosecuted," he told reporters.
Acid is used intermittently as a weapon in Afghanistan. In the conservative and Taliban-influenced south and east, it has been thrown at girls attending schools.
With foreign combat troops set to return home by the end of 2014, some activists inside and outside Afghanistan fear that women's rights may be sacrificed in the scramble to ensure the West leaves behind a relatively stable state.