Extermination Camp

What do you call a place where you close in people with certain characteristics, and then send in soldiers with orders to shoot all people with these same characteristics?

"The US-backed government put rebel losses at more than 2,000, although unit commanders later revealed their troops had orders to shoot all males of fighting age seen on the streets, armed or unarmed, and ruined homes across the city attest to a strategy of overwhelming force."

Earlier:

"The military says keeping men aged 15 to 55 from leaving is key to the mission's success."

The extermination camp described above is Fallujah.

The first-quoted paragraph from an AFP article was discovered by Eli @ Left I.