The bloody attacks in Mumbai last November could provide a model for the United States to improve security at vulnerable targets like hotels or malls, US anti-terrorism officials told Congress Thursday. "Other terrorist groups will no doubt take note of and seek to emulate the Mumbai attacks," said Donald Van Duyn, the FBI's top intelligence chief, during a Senate hearing. "We sometimes focus on tactics that may be exotic and esoteric but for most terrorists, they're looking for what works. In order to better protect against attacks in public places, New York police commissioner Raymond Kelly encouraged engaging the owners of these possible targets. "We let them know what to look for and what to do if they observe suspicious behavior," said Kelly, referring to a similar effort engaged by New York police. "We also emphasize knowing who's in your building." Kelly highlighted the "relative simplicity of this attack" in Mumbai, where "10 people with basic weapons" managed to wreak bloody havoc in the city for three days. "Public-private interactions are crucial and must be developed before an incident occurs," said Charles Allen, intelligence chief at the Department of Homeland Security.