Dirty bombs employ conventional explosives to scatter radioactive material into the surrounding atmosphere. “New York and Washington are still the biggest risks in the country,” Bratton told the newspaper. “We come in right behind them because of the special assets we have: the port, the airport and just the symbolism of so much of what they hate.” Bratton said the department has been awarded $3 million in Homeland Security funds and also used that money to buy a $900,000 bomb-response truck that has a robot that can be operated from a mile away. SECURITY: Bratton says city is big target for terrorists because of its “special assets.” By City News Service Saying it’s only a matter of time before America is the target of a dirty bomb, Los Angeles Police Chief William Bratton has purchased seven devices that can sniff out the radioactive signature of such a device, it was reported Saturday. The Los Angeles Times reports that one of the devices has been installed in a helicopter and is capable of detecting an unexploded dirty bomb from an altitude of 800 feet. The department also invested in a mobile response truck for LAPD public information officers, to serve as a portable center for communicating information via news media, the chief said.160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set!