From The Wall Street Journal:
WASHINGTON -- The Mumbai attacks have prompted some Western officials to step up vigilance against the type of low-tech assault the 10 gunmen mounted last month.
Since the attacks in Mumbai, al Qaeda Web sites and chatrooms have lit up with aspiring militants urging more such attacks, according to the Washington-based SITE Intelligence Group. One message cheered "the heroes" of the attack for making "the enemies suffer," including the U.S., the U.K. and Israel.
Historically, the group accused in the attack, Lashkar-e-Taiba, has focused on furthering Pakistan's claims to the Kashmir region, disputed with India. Although its messages have a strong anti-American component, U.S. officials have seen the group as a lesser counterterrorism priority.
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My Comment: It will probably be only a matter of time before such an attack happens.