An unknown number of assailants have opened fire at an elementary school in the southern Pakistani city of Karachi, killing the school's principal.
The attack came as students, aged 5 to 10 years old, gathered to learn the results of their annual exams on March 30.
At least eight students were reported wounded in the gunfire.
"In 15 minutes [after the beginning of a prize-distribution ceremony], suddenly a man ran in firing," Attaur Rehman, a teacher injured in the attack, told journalists at the city hospital.
"We were all engrossed in the magic show. But as soon as the firing started, there was a stampede. I think [the attackers] also lobbed two hand grenades."
Police said the principal was a member of the Awami National Party, comprised mainly of Pashtuns from Pakistan's northwestern regions.
No one has claimed responsibility for the attack.
Karachi, a city of about 18 million people, has long been plagued by ethnic, political, and sectarian violence.
Based on reporting by AFP, Reuters, and AP