No restrictions are imposed by the statute; and the BIA itself held in Matter of Patel, 15 I. N. Dec. 666 (BIA 1976): "An alien generally is not and should not be detained or required to post bond except on a finding that he is a threat to the national security, Carlson v. Landon, 342 U.S. 524 [ 72 S.Ct. 525, 96 L.Ed. 547] (1952), or that he is a poor bail risk, Matter of Moise, 12 I. N. Dec. 102 (BIA 1967); Matter of S___ Y___ L___, 9 I. N. Dec. 575 (BIA 1962)." III.