Six Pakistani employees of the Christian aid charity World Vision were killed Wednesday in an attack on the group’s office in the country’s northwestern Mansehra district, the Associated Press reports.

Police said 10 gunmen with grenades entered the charity’s office in the small town of Ogi and began firing indiscriminately. Four people were wounded in the attack.

World Vision is one of several humanitarian groups working in the region with survivors of the 2005 Kashmir earthquake, which killed 80,000 people. Some charities have pulled out of the area amid increasing attacks by Islamic militants.

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