where, whom from, and how did he get weapons being a foreigner 5 days in the IS.
May aliens legally in the United States purchase firearms?
An alien legally in the U.S. is not prohibited from purchasing firearms unless the alien is admitted into the U.S. under a nonimmigrant visa and does not meet one of the exceptions as provided in 18 U.S.C. 922(y)(2), such as possession of a valid hunting license or permit.
[18 U.S.C. 922 (d)(5), (g)(5) and (y)(2); 27 CFR 478.11 and 478.32(a)(5) ]
http://www.atf.gov/firearms/qa/may-aliens-legally-united-states-purchase-firearms
...buying a gun is harder than it would be for him to vote.