Drill Will Test Homeland Security Readiness in Boston

Scenario to use multiple explosions, including dirty bomb; will test commuication and collaboration

Less than a week after the fifth anniversary of the Sept. 11, 2001 terrorist attacks, one of the largest antiterror drills ever in New England will test how public safety officials deal with some of their worst fears all at the same time.

The nightmare scenario starts with an explosion in a basement lab in Everett, jumps to a threat to the liquefied natural gas facility in Everett, and mushrooms to multiple explosions, one involving a radioactive "dirty bomb," inside the CambridgeSide Galleria mall, according to a memo obtained by the Globe yesterday.

Finally, as patrons flee the mall, at least one improvised explosive device is found at the nearby Lechmere MBTA station, according to the memo outlining Operation Poseidon, scheduled for the morning of Sunday, Sept. 17.

The drill, which will soon be announced to minimize public alarm, ends with a fictional 25 dead and 150 wounded.

Law enforcement officers, firefighters, and paramedics will re spond to each incident. An undetermined number of people will pretend to be customers at the mall, riders on the T, and possible terrorists.

Sponsored by the state Executive Office of Public Safety and Boston Mayor Thomas M. Menino's Office of Homeland Security, the exercise is designed to bring together federal, state, and local agencies, as well as hospitals and the National Guard, to coordinate and improve how they respond, communicate, and work together to tackle the fast-moving series of threats.

"It's really the best way to make sure everyone is working well together," said Peter Judge, spokesman for the Massachusetts Emergency Management Agency.

Law enforcement, military, federal, and emergency medical workers, as well as firefighters, will be tested on their response to a bombing in which there could be secondary devices in multiple locations and how they "identify potential suspects who may continue to linger in the area following an initial blast," the memo said.

Officials at the CambridgeSide Galleria said the exercise is scheduled to start around 4 a.m., well before the mall opens that day at 11 a.m. In addition, the mall's neighbors have been notified by the Cambridge Fire Department.

The last high-profile terrorism training event in Boston happened in June 2005 with the simulation of a terrorist hijacking of an airliner en route from Paris to Chicago, the first US drill involving the real-time intercept of a commercial airliner by military jets.

More than 50 federal, state, and local agencies participated in the $750,000 exercise, paid for by a federal homeland security grant. More than 80 volunteers, posing as hostages, spent two hours in the air. Once F-15 fighter jets forced the United Airlines plane to land at Logan International Airport, the hijackers detonated a "bomb" in the plane's cargo hold, "killed" a 14-year-old girl, and threw a dummy representing her body from the rear door. Police stormed the plane and arrested five terrorists, and the "injured" were sent to at least nine area hospitals.

Next month's exercise, also paid for by grants from the federal government, is expected to cost much more, with 81 state troopers being paid $78,000 in wages alone, said Andrew Plunkett, spokesman for the Executive Office of Public Safety.

State and city officials yesterday could not provide a total price tag or number of participants.

The exercise combines a threat to an LNG facility one of the Boston region's biggest vulnerabilities with a kind of attack that some homeland security specialists fear will be the next level of terrorism, based on events that have happened elsewhere.

The scenario begins when Everett police respond to a call from a citizen regarding suspicious activity at a home, possibly drug-related.

But as police close in on the home, a van with several men inside is seen leaving the area. This is followed by an explosion in the basement of the home, where police quickly find a laboratory.

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