En lang række lande, herunder [[Canada]], [[Kina]], [[Storbritannien]], [[Frankrig]], [[Rusland]], [[Tyskland]], [[Indien]] og [[Pakistan]], indførte en anti-terror lovgivning og lukkede en række bankkonti tilhørende enkeltpersoner, der var mistænkt for at have forbindelse til al-Qaeda.<ref>{{cite web |last=Hamilton |first=Stuart |title=September 11, the Internet, and the effects on information provision in Libraries |work=68th IFLA Council and Conference |date=24. august 2002 |url=http://www.ifla.org/IV/ifla68/papers/156-079e.pdf |format=PDF |access-date=8. september 2006}}</ref><ref>{{cite web |url=http://www.g8.fr/evian/english/navigation/g8_documents/archives_from_previous_summits/kananaskis_summit_-_2002/g8_counter-terrorism_cooperation_since_september_11th_backgrounder.html |title=G8 counter-terrorism cooperation since September 11 backgrounder |access-date=14. september 2006 |publisher=Site Internet du Sommet du G8 d'Evian |archive-date=21. juli 2006 |archive-url=https://web.archive.org/web/20060721202419/http://www.g8.fr/evian/english/navigation/g8_documents/archives_from_previous_summits/kananaskis_summit_-_2002/g8_counter-terrorism_cooperation_since_september_11th_backgrounder.html |url-status=dead }}</ref> Retshåndhævende myndigheder og efterretningstjenester i en række lande, herunder [[Italien]], [[Malaysia]], [[Indonesien]] og [[Filippinerne]], anholdt personer, som de mistænkte for at stå bag terror.<ref>{{cite web |last = Walsh |first = Courtney C |title = Italian police explore Al Qaeda links in cyanide plot |publisher = Christian Science Monitor |date= 7. marts 2002 |url = http://www.csmonitor.com/2002/0307/p07s02-woeu.html |access-date =8. september 2006}}</ref><ref>{{cite web |title = SE Asia unites to smash militant cells |publisher = CNN |date= 8. maj 2002 |url=http://edition.cnn.com/2002/WORLD/asiapcf/southeast/05/07/seasia.terror.pact/ |access-date = 8. september 2006}}</ref>
Historie