The National Park Service will begin enforcing a camping ban against Occupy DC protesters in McPherson Square and Freedom Plaza Monday, but it’s still not clear what that could mean for the demonstrators who have been camped there since October.

A Park Service notice posted at both camps Friday warned protesters that anyone caught sleeping or preparing to sleep in the parks could face arrest starting at noon Monday. It instructs protesters to remove all camping material — like sleeping bags and air mattresses — from their tents to comply with the camping ban.