At least three D.C. public schools were broken into over the Thanksgiving break, with thieves making off with more than 10 computers. The thefts aren’t isolated—various schools and libraries have seen expensive computers, often Macs, stolen over the last two years.

According to the Post, five suspects broke into Brightwood Elementary School last Friday, carting off an unstated amount of computer equipment. (A video of the suspects is below.) On Sunday, six iMacs were stolen from Brent Elementary School, the second such theft since October. (All told, 12 computers have been stolen from the school.) Stanton Elementary School on Alabama Avenue SE was also targeted over the weekend; five computers were stolen from there.

The thefts are but a drop in the bucket of what the Walker-Jones Elementary School along New Jersey Avenue has experienced over the last two years, though. According to reports from MPD and DCPS, 34 computers were stolen from the campus during five incidents between March and September 2011. (Some of those break-ins happened even after D.C. officials pledged to increase lighting and security at the building.) All told, it’s estimated that thieves have made off with almost 100 computers from the school.

D.C. libraries have also been targeted. Six computers were stolen from the new Francis Gregory Neighborhood Library in Ward 7 in July; in March, one Mac was stolen from the Northwest One Library, which is attached to Walker-Jones. According to testimony given by D.C. Chief Librarian Ginnie Cooper to a D.C. Council committee this fall, there have been 10 break-ins at public libraries over the last two years. All told, the thefts have cost the city $65,000—$50,000 to replace the computers and $15,000 for repairs to the buildings. In that hearing, Cooper said that D.C. libraries were increasing security measures to prevent the break-ins.

People with knowledge of the thefts have said that the computers have been stolen only to be sold off quickly, sometimes to people within the very community from where they were stolen.