After the hostage-taking was reported, dozens of police and rescue vehicles surrounded the home and a negotiator was keeping in touch with the gunman, police said.

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Mr. Deveau, the Watertown police chief, said authorities stationed a negotiator on the second floor of the house who could see the boat clearly.

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Jeff Talley, a former negotiator with the Los Angeles Police Department, is plunged back into precisely the kind of high-pressure situation that drove him out of the city in the first place, and which contributed to the breakdown of his marriage.

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Prospect union negotiator, Steve Thomas, said questions remained over the logistics of how the area covered by several police forces across the north east of England would be served.

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