More than 500 Dreamers who lost their benefits due to criminal activity are still at large in the United State despite deportation orders, according to a U.S. Citizenship and Immigration Service (USCIS) report.

USCIS sent its report to Senate Judiciary Chairman Sen. Chuck Grassley.

According to USCIS, 2,127 had their Deferred Action for Childhood Arrivals (DACA) status revoked since 2013 for criminal convictions or gang activity.

The breakdown of action taken following the DACA terminations:

Persons removed from the U.S.: 562

In ICE custody: 90

Released from ICE custody: 535

No record of removal, detention or release by ICE: 940

"While it is reassuring that USCIS is revoking DACA benefits for criminal gang members it identifies, it is concerning that almost as many criminal alien DACA beneficiaries have been released as have been removed to their home country," Center for Immigration Studies (CIS) Policy Studies Director Jessica Vaughan wrote.

"I assume that at least some of the 940 criminals who had DACA but who have not been removed are still in state or local custody serving time, but it is possible, even likely, that some were released by sanctuary jurisdictions, and ICE has not re-apprehended them," Vaughan wrote.