Under the cover of darkness Sunday night, vandals downed alcohol, threw rocks and smashed the windows -- along with over a decade of hard work, financial sacrifices and prayers -- of a Chantilly mosque.

The Ahmadiyya Muslim community was reeling Monday after learning of the destruction at the construction site, which leaders estimated could cost up to $60,000 to repair. The vandals took out most of the glass windows and doors on the first floor, and even two windows high on the second floor.

"It's kind of devastating to see," said Usman Ghumman, the general secretary. "All the windows are smashed in, like in an insane way. Like somebody went systematically, door to door, to whatever's reachable."